Glossary of Terms


Navigate the Glossary either via the interactive search or filter by alphabet or number.

Cab Display Unit (CDU)
A device for use in the driving cabs that enables the user to receive and return coded electronic tokens, and to display electronic Tokens issued to it. The CDU may be transportable.

Regional
Disciplines: Train Control, Rolling Stock
Cab Secure Radio (CSR)
A secure radio communication system between driver and signaller.

Regional
Disciplines: Train Control, Rolling Stock
Cab Signal
Refer In-cab Signalling

Alternative
Disciplines: Train Control, Operations
Cable
An insulated electrical conductor, or group of conductors separately insulated and contained within the one insulating sheath.

Preferred
Disciplines: Train Control, Electrical
Cable Joint
The electrical in-line connection of the conductors of two lengths of cable and the insulation and sealing of those connections.

Preferred
Disciplines: Electrical
Cable Pit
A partially buried chamber through which underground cables run and are accessible at that point. Frequently installed to facilitate the pulling of cables through underground conduits.

Regional
Disciplines: Electrical, Infrastructure
Cable Route
The route and its method of construction for cables running between equipment locations (main cables) or between equipment locations and trackside equipment (tail cables, local cables).

Regional
Disciplines: Electrical, Infrastructure
Cable Troughing
Lidded ducting for housing cable runs in surface cable routes, e.g. ground level troughing GLT or troughing elevated on posts (pegline).

Regional
Disciplines: Electrical, Infrastructure
Cabotage
The carriage of a container from a surplus area to an area specified by the owner of that container, in exchange for which and during the operator can use the container.

Preferred
Disciplines: Operations
Cadweld
Commercial brand of copper aluminothermic weld commonly used for joining copper cables to rail, other cables or other steel structure.

Regional
Disciplines: Electrical, Infrastructure
Call-by
The authority given by a signaller to a driver to pass a signal at danger.

Regional
Disciplines: Train Control
Call-on (route Class)
A route that is provided to permit a train movement into a section known to be occupied.

Regional
Disciplines: Train Control
Calling On Signal
Subsidiary signal fixed under the accept/home, home or home/starting signal for the route concerned and when showing a 'proceed' indication authorises the driver to proceed under control into a section of line which may be obstructed at any point.

Regional
Disciplines: Train Control
CAN
Condition Affecting the Network

Preferred
Disciplines: Operations
Cancel
To end previously authorised activities, such as Occupancy Authorities, without completing them.

Preferred
Disciplines: ALL Disciplines
Cancelling Indicator (AWS)
A lineside sign which denotes that an AWS warning does not apply to trains in that direction.

Regional
Disciplines: Operations
Cane Railway Network
A railway system dedicated to hauling harvested sugar cane from farms to a raw sugar factory. Typically 610 mm gauge.

Regional
Disciplines: Operations, Train Control
Cant
Generally, the term Cant or Superelevation is used for intended height difference in the rails (i.e. where the track is inclined in a curve), and the term 'cross-level' is used for unintended height difference (i.e. due to track irregularity).

Preferred
Disciplines: Infrastructure
The height difference, at a common location, between the running surface of both rails. Also known as Superelevation or Cross Level.
Preferred
Disciplines: Infrastructure
Alternate Term: Superelevation or Cross Level
Cant Deficiency
A train travelling at line speed such that the outward centrifugal force is greater than the effect of the inward applied cant is said to be at Cant Deficiency. In this situation there is a net lateral force on the train towards the outside of the curve.

Preferred
Disciplines: Infrastructure, Rolling Stock
Cant Excess
A train travelling slowly or stopped such that the outward centrifugal force is less the effect of the inward applied cant is said to be at Cant Excess. In this situation there is a net lateral force on the train towards the inside of the curve.

Preferred
Disciplines: Infrastructure, Rolling Stock
Cant Imbalance
The term Cant Imbalance indicates a net lateral force on the train that could be towards the outside of the curve (Cant Deficiency) or towards the inside of the curve (Cant Excess).

Preferred
Disciplines: Infrastructure, Rolling Stock
Cant Ramp
A transition in applied cant to the track, usually at the entry or exit to a curve, which by design varies from a maximum value to zero, or vice versa, over a prescribed length of track.

Preferred
Disciplines: Infrastructure
Cantilever
A structure that incorporates an overhang, to position a signal head for signal sighting purposes.

Regional
Disciplines: Train Control, Infrastructure
Cantrail
Main longitudinal structural member of vehicle roof which forms the extreme edges of the frame.

Preferred
Disciplines: Rolling Stock
Car
Alternative (US) term for vehicle or wagon.

Alternative
Disciplines: Rolling Stock
Carbon Silver Contact
Contact surfaces composed of silver impregnated carbon to prevent contact surfaces fusing together; this is considered to be a risk with using metal to metal contacts in signalling circuits, particularly front contacts of devices with gravity drop away.

Preferred
Disciplines: Electrical, Train Control
Card
Identifies a wagon with a mechanical defect.
Also see 'defect card'.

Alternative
Disciplines: Rolling Stock
Carriage
A passenger carrying vehicle unit.

Preferred
Disciplines: Rolling Stock, Operations
Catch Handle
A handle on a mechanical lever attached to a latch which holds the lever in a specific position within the lever frame. Also reffered to as 'catch-rod handle'.

Regional
Disciplines: Train Control
Catch Points
A set of points designed to prevent unauthorised access to a section of track by prior intentional derailment of vehicle.

Preferred
Disciplines: Infrastructure, Operations
Catch Rod
A rod connected to the catch handle of a mechanical lever which engages, directly or through the means of a catch block, with the quadrant of the interlocking frame, to hold the lever in the desired position.

Regional
Disciplines: Train Control
Category 'A' Incidents
These constitute the minimum standard requirements for incidents and accidents to be recorded by the Rail Transport Operator, for major incidents and accidents resulting in serious injury, death or significant damage.

Preferred
Disciplines: ALL Disciplines
Category 'B' Incidents
This set of incident types are mainly minor accidents or occurrences which constitute a breakdown in normal safety to be recorded by the Rail Transport Operator to enable satisfactory monitoring and analysis of safety related occurrences.

Preferred
Disciplines: ALL Disciplines
Catenary Wire
In overhead electrification, the uppermost of the two overhead wires mounted above the track and supporting the contact wire.

Preferred
Disciplines: Electrical, Infrastructure
Caution (aspect)
An aspect which advises the driver that the next signal may be at danger, requiring the train to stop. It is indicated by a single yellow (Aspect) or a semaphore distant arm horizontal.

Preferred
Disciplines: Train Control, Operations
Caution Board
A temporary speed board with the word CAUTION and a speed plate attached to warn drivers of the speed at which trains are to travel over the next portion of the line which may be unsafe at normal speed.

Legacy
Disciplines: Train Control, Operations
Refer Temporary Speed Restriction Ahead Sign
Preferred
Disciplines: Train Control, Operations
Caution Fixed Signal
An indication provided by a fixed signal. The next fixed signal may be at STOP .

Regional
Disciplines: Train Control, Operations
Caution Handsignal
A handsignal given to indicate the need for rail traffic to proceed but being prepared to stop.

Preferred
Disciplines: Operations
CBI
Abbreviated term for 'computer based interlocking'.

Computer Based Interlocking (CBI)

Preferred
Disciplines: Train Control
CBTC
Abbreviated term for Communications Based Train Control

Communications Based Train Control (CBTC)

Preferred
Disciplines: Train Control, Rolling Stock
CCSB
Constant Contact Side Bearers

Constant Contact Side Bearers (CCSB)

Preferred
Disciplines: Rolling Stock
CCTV
Abbreviated term for 'closed circuit television'.

Closed Circuit Television (CCTV)

Preferred
Disciplines: ALL Disciplines
CDU
Abbreviated term for 'cab display unit'.

Cab Display Unit (CDU)

Preferred
Disciplines: ALL Disciplines
CEMS
Abbreviation for 'Crash Energy Management System'.

Crash Emergency Management System

 

Preferred
Disciplines: Rolling Stock
Centralised Traffic Control (CTC)
A system of Safeworking where points and signals at a number of locations are remotely controlled from a centralised control room or other locations.

Preferred
Disciplines: Train Control, Operations
Centralised Traffic Control (CTC) Territory
The portions of line where the Centralised Traffic Control system of Safeworking is used.

Regional
Disciplines: Train Control, Operations
Centre Throw
The curve throw of the vehicle body towards the inside of a horizontal curve at the vehicle centre. The body centre is the position of maximum inwards curve throw for a symmetrical vehicle.

Preferred
Disciplines: Rolling Stock
Centre-fed Track Circuit
A track circuit wherein the current is supplied at or near the centre with relays at each end.

Regional
Disciplines: Electrical, Train Control
Certification
The process by which an independent competent person certifies the compliance for a class of rolling stock with the AS7500 series of Australian standards.

Preferred
Disciplines: Rolling Stock
Certify
1. To classify a worker as competent; or
2. To classify infrastructure or rolling stock as fit for purpose.

Preferred
Disciplines: ALL Disciplines
Cess
The area from the edge of the ballast profile to either the edge of the embankment or the toe of the cutting.
cess drain: refers to the surface drain provided outside the sleepers to drain water from the ballast.

Preferred
Disciplines: Infrastructure
CFR
Code of Federal Regulations (US)


Disciplines:
Abbreviated term for the US 'Code of Federal Regulations'.
Overseas
Disciplines:
Chair
A rail base plate fixed to the sleeper that provides vertical support to the rail.

Preferred
Disciplines: Infrastructure
Channel Pin
Grooved, tapered steel pin which is used to secure a bond wire to form a reliable connection between the rail and bond wire. It is driven into the hole in the web of the rail alongside the bond wire.

Regional
Disciplines: Infrastructure, Electrical
Check Locking
An arrangement to prevent the full stroke of a lever in a lever frame until such time as the apparatus controlled by that lever has completed its movement.
Also see Backlocking.

Regional
Disciplines: Train Control
Check Rail
Rails placed in track inside the running rail at particular locations which comes into contact with the back of the wheel flange to guide wheels through points and crossings, on curves and through flangeway gaps in streets.

Preferred
Disciplines: Infrastructure
Checking Circuit
Group of circuits used for the operation of checking apparatus.

Preferred
Disciplines: Electrical
Chock Block
Refer Derailer.

Legacy
Disciplines: Infrastructure
Chopper Coupling
A coupling system between rolling stock which consists of a central buffer with a mechanical hook that drops into a slot in the central buffer.

Preferred
Disciplines: Rolling Stock
Chromaticity (signal Lenses)
Colour quality expressed numerically.

Preferred
Disciplines: Train Control
Chromaticity Co-ordinates
Two numbers that fix the position of a point on a colour diagram in order to numerically and graphically represent the colour of a lens or light source. The numbers represent the proportions of two of three primary colours in a mixture that matches the colour specified. These proportions are expressed in terms of the co-ordinates x, y in the CIE colorimetric system (AS 2633).

Preferred
Disciplines: Train Control
Circuit
An arrangement of conductors and electrical apparatus connected to a source of electricity supply.
Refer Open Circuit.

Preferred
Disciplines: Electrical
Circuit Breaker
A switch suitable for opening a circuit automatically as a result of predetermined conditions, such as those of overcurrent or undervoltage or by some form of external control.

Preferred
Disciplines: Electrical
Circuit Controller
A device for opening and closing electric circuits.

Preferred
Disciplines: Electrical, Train Control
Circuit Function Test To Wiring Diagram
This is the energisation of each circuit, or part of a circuit, and verifying by operation or disconnection that each and every control device, fuse and link is effective in controlling the circuit function in accordance with the circuit diagram. The specific contacts on control devices such as relays are not verified.

Regional
Disciplines: Electrical, Train Control
Circuit Strap And Function Test To Wiring Diagram
This is a more in-depth circuit function test. It is the energisation of each circuit, or part of circuit, and verifying by operation or disconnection that each and every control contact, fuse and link is effective in controlling the circuit function in accordance with the circuit diagram.

Regional
Disciplines: Train Control, Electrical
Circular Curve
A curve of constant radius.

Preferred
Disciplines: Infrastructure
Civil Infrastructure
General term for all the fixed structures required for a railway line, i.e. the track and its foundations, bridges, drains, signals and overhead electrification.

Preferred
Disciplines: ALL Disciplines
Clamp Lock Point
A type of point operating mechanism which clamps the point switch to the stock rail. It provides direct switch to stockrail facing point locking through a vertically operating clamp arm and includes in-built point switch and lock detection and is hydraulically powered.

Regional
Disciplines: Train Control
Class
A class of rolling stock is a group of vehicles built to the same design.

Preferred
Disciplines: Rolling Stock
Claw Lock Point
A point operating mechanism which provides direct switch to stockrail facing point locking through a horizontally operating claw arm which requires external point switch and lock detection and is powered by a purpose built electric point machine or electro-pneumatic (EP) motor.

Regional
Disciplines: Train Control
Clear
A proceed indication displayed by a signal.
In reference to a track circuit, block, section or signal route, signifies the absence of rail traffic.

Preferred
Disciplines: Train Control, Operations
Clear And Complete
Rail traffic where the last vehicle of a consist has passed beyond a location.

Preferred
Disciplines: Operations
Clearance Bar
A bar fixed alongside the rail and terminating at the clearing point of two converging lines. The clearance bar is interlocked with the points in such a manner that they cannot be moved while a train is passing over or standing on the bar.

Regional
Disciplines: Train Control
Clearance Handsignaller
A handsignaller at a clearance location, who reports the clearance of rail traffic past that location

Preferred
Disciplines: Operations
Clearance Lines
The lines painted on the roadway to delineate the safe clearance between trams and other road vehicles.

Preferred
Disciplines: ALL Disciplines
Clearance Location
A location that, once clear of rail traffic, allows a following movement. Also known as clearance point.

Preferred
Disciplines: Operations
Clearance Point
The nominated point where rail traffic are deemed clear of others at converging points or other locations.
This point may or may not be delineated by signs or clearance post.

Preferred
Disciplines: Operations, Infrastructure
Clearance Post
A post, marker, light or disc to indicate the clearance point of two converging lines.

Preferred
Disciplines: Operations
Clearance Sign
A sign defining the end of at the end of a temporary speed restriction or Work on Track Authority to indicate to rail traffic crew that normal track speed can be resumed.

Preferred
Disciplines: Operations, Infrastructure
Clearing Control
A control used on some block telegraph sections. On sections where clearing control is in operation, it prevents the block instrument at B from giving 'train arrived' until the train has arrived complete within the home signal at B.

Regional
Disciplines: Train Control
Clip
Resilient rail fastening.

Preferred
Disciplines: Infrastructure
Clip Fastening Plate
A rail support plate designed for resilient fastenings.

Preferred
Disciplines: Infrastructure
Close Up Signal
A subsidiary signal fixed on the post of a signal and indicating, when cleared, that the line ahead is clear to the next 'stop' signal only.

Regional
Disciplines: Train Control
Closed Circuit Television (CCTV)
Equipment that is used for remote monitoring and supervisory purposes, usually at a station platform or level crossing.

Preferred
Disciplines: ALL Disciplines
Closely Approaching
Going towards a location at a speed such that the train crews could not be expected to react in sufficient time to stop.

Preferred
Disciplines: Operations
Closing Keys
Interlocking keys with bow handles for securing frames at stations and other places when closed.

Regional
Disciplines: Train Control
Closing Lever
A lever, in an interlocking machine, which, when operated to reverse, will cause the signals on the main line through routes to either operate automatically or remain in the clear position.

Regional
Disciplines: Train Control
Closing-up Signal
A signal that is provided to optimise headways and/or to provide earlier clearance of junctions on the approach to stations. It may or may not form part of the normal aspect sequence.

Regional
Disciplines: Train Control
Closure List
Final index of design details issued to the tester-in-charge by the design organisation.

Overseas
Disciplines: Train Control
Closure Rail
A rail located between switch and crossing components, cut to a length to fit the requirements of the turnout.

Preferred
Disciplines: Infrastructure
Co-acting Signal
A signal, placed near another signal that might be temporarily obscured from a rail traffic crew's view, to provide information about the obscured signal's indication.

Preferred
Disciplines: Train Control, Operations
Co-axial Cable
An insulated conductor within a conductive sleeve covered by an insulating sheath. The conductor and sleeve form the two conductors of the one circuit.

Preferred
Disciplines: Train Control, Electrical
Coded Track Circuit
Impulse current track circuit in which the number, frequency, polarity or duration of the impulses or several of these characteristics at a time are utilised in order to permit selection of action on several receiving apparatus units, specially adjusted for these and connected to the same track circuit.

Regional
Disciplines: Train Control, Electrical
COFC
Container on Flat Car


Disciplines:
An abbreviated term for 'container on flat car'.
Alternative
Disciplines: Rolling Stock
Cold Standby
Form of redundancy in which the secondary equipment is normally powered down, to be switched in and begin operating and generating output after a failure of the primary equipment. Results in a loss of system function while the secondary equipment powers up and reaches operational status.

Regional
Disciplines: Train Control, Operations
Collar
A facility that prevents the signaller from operating an item of signalling infrastructure. Either a physical item preventing the pulling of a lever or operation of a button, or an electronic equivalent indicated on the signallers workstation. The formal term for collar is reminder appliance.

Regional
Disciplines: Train Control
Collision
A collision between trains, other rolling stock vehicles or obstructions on main running lines.

Preferred
Disciplines: ALL Disciplines
Colour Light Signal
A fixed signal which uses coloured electric lights to give the signal indications during both daylight and dark.

Preferred
Disciplines: Train Control
Combiner
Apparatus which, in certain route lever boxes, allows each route lever to operate controls of the various apparatus for that route

Regional
Disciplines: Train Control
Commission
To formally place into active service or use.

Preferred
Disciplines: ALL Disciplines
Common
occurring, found, or undertaken often; prevalent

Preferred
Disciplines: ALL Disciplines
Common Rail
The rail of a single rail track circuit that is electrically common to one or more adjacent track circuits or forms the traction return path.
In non-electrified areas the common rail is bonded with track circuit bonding.
In electrified areas the common rail is known as the traction return rail and carries the traction return current. It is therefore bonded with traction return bonding.

Regional
Disciplines: Electrical, Train Control
Common Return Circuit
A term applied where one wire is used for the return of more than one electric circuit.

Preferred
Disciplines: Electrical, Train Control
Communication Device
A device that supports effective communication between Competent Workers.

Preferred
Disciplines: ALL Disciplines, Operations
Communications Based Train Control (CBTC)
A signalling system that makes use of the telecommunications between on-board equipment and wayside equipment for the traffic management and infrastructure control

Preferred
Disciplines: Train Control
Compatibility
the ability to work in conjunction with another specified system

Preferred
Disciplines: ALL Disciplines
Compensator
An appliance with a pair of cranks so connected as to reverse the direction of travel in a run of iron rodding, and thereby counteract the expansion or contraction caused by changes of temperature.

Regional
Disciplines: Train Control
Competent Worker
A worker certified as competent to carry out the relevant task.

Preferred
Disciplines: ALL Disciplines
Complete
Rail traffic where the consist has not parted.

Preferred
Disciplines: Operations
Compound
A combination of diamond and turnouts connecting the intersecting tracks within the diamond. Single compounds require two sets of points and double compounds require four sets of points.

Preferred
Disciplines: Infrastructure
Compound Curve
A curve comprising two or more differing radii but in the same direction.

Preferred
Disciplines: Infrastructure
Comprehensive Approach Locking
Approach locking including controls that will allow the immediate release of approach locking if no train is approaching the signal. It uses look back logic to ascertain the line occupancy between a given signal at danger and the sighting point of the signal displaying the first caution aspect for the signal under consideration.

Regional
Disciplines: Train Control
Computer Assisted Train Orders
A computer system which assists the train controller in compiling, issuing, cancelling and recording train, mishap and shunt orders and track warrants, and provides a graphical representation of the extent of orders and warrants issued, location of trains and crossings programmed.

Preferred
Disciplines: Train Control, Operations
Computer Based Interlocking (CBI)
A computerised software system for providing the interlocking between points and signals.

Preferred
Disciplines: Train Control
Concentrator
A facility to connect several telephone circuits to one handset.

Regional
Disciplines: Train Control, Electrical
Concreted Track
Track constructed with concrete under and to the top of the rails.

Regional
Disciplines: Infrastructure
Condition Affecting The Network (CAN)
A situation or condition that affects or has the potential to affect the safety of the network.

Preferred
Disciplines: Operations
Conditional Clearance
The clearance of a train stop or signal at a reduced overlap clearance point, conditional upon trains approaching the train stop or signal at a reduced speed commensurate with the requirement of a reduced overlap distance.

Regional
Disciplines: Train Control
Conditional Failure
Items of signalling equipment are fail safe where they are particularly specified, designed, manufactured, installed, inspected, tested and maintained such that the chance of an unsafe side failure is very low. Component parts are robust, electrical leakage distances are long, operating characteristics have large margins, etc.

Regional
Disciplines: Train Control
Conditional Interlocking
Interlocking between two movable parts occasioned by the particular positions of other parts.

Preferred
Disciplines: Train Control
Conditional Locking
Locking Interlocking between two signalling functions that are dependent upon the state of other signalling functions.

Preferred
Disciplines: Train Control
Conditional Proceed Authority
An authority to proceed in the indicated direction conditional upon the rail traffic crew obeying instruction to cross other rail traffic specified in the associated crossing instructions.

Preferred
Disciplines: ALL Disciplines, Operations
Conflicting Locking
Interlocking between two routes that require one or more points set in opposite positions. Also see Direct Opposing Locking.

Preferred
Disciplines: Train Control
Conflicting Routes
Two or more routes, opposing, converging, or intersecting, over which train movements cannot be made simultaneously without possibility of collision.

Preferred
Disciplines: Train Control
Conformal Contact
Wheel and rail profiles that have a very similar shape. A measure of that closeness is that conformal contact should have a maximum gap of 0.1mm between the undeformed shapes of the wheel and rail profiles at the gauge corner.

Preferred
Disciplines: Rolling Stock
Connecting Rod
The rod connecting the spreader bar to the point lever or other operating mechanism.

Preferred
Disciplines: Infrastructure
Consist
Listed order of the vehicles arranged to make up a complete train.

Preferred
Disciplines: ALL Disciplines
Consolidated Yard
An area where interlocking's controlled by one signalling location have intervening permissive signals. The area is defined exclusively by a YARD LIMIT sign and an END OF YARD LIMIT sign.

Regional
Disciplines: Train Control, Operations
conspicuity
Easily seen or noticed; readily visible or observable.

Preferred
Disciplines: Operations, Rolling Stock
Constant Contact Side Bearers (CCSB)
Type of side bearer in which they are sprung and in constant contact with the underside of the wagon body, as opposed to a sidebearer is solid and has an air gap.

Preferred
Disciplines: Rolling Stock
Constrained Curving
A description related to curving performance of a rail vehicle. A condition where, as well as the leading wheelset of a bogie or rigid vehicle wheelbase being in flange contact with the outer rail of a curve, the trailing wheelset of the bogie or rigid vehicle wheelbase is also in flange contact with the inner rail of the curve.

Preferred
Disciplines: Rolling Stock, Infrastructure
Construction Engineer
An engineer engaged to be in charge of a track or infrastructure work site, or section of line upgrading program.

Preferred
Disciplines: ALL Disciplines
Construction Joints
A joint in a structure made for convenience of construction. It has to be designed so that the load-carrying capacity and serviceability of the structure will be unimpaired by inclusion of the joint.

Preferred
Disciplines: Infrastructure
Contact
A pair of conducting pieces which co-act to open or close an electric circuit.

Preferred
Disciplines: Electrical, Train Control
Contact Adjustment
Adjustment of the operating linkages, cams, armature, or the position of the contact pieces, to open and close the contact as required in relation to the operating mechanism.

Preferred
Disciplines: Electrical
Contact Gap
Distance between parts of a contact when open.

Preferred
Disciplines: Electrical
Contact Proving Test
This is an apparatus inspection and apparatus function test to prove that equipment contacts are the correct type, are correctly adjusted and electrically open and close when the equipment is operated.

Preferred
Disciplines: Electrical
Contact Resistance
The electrical resistance produced by the contact of two conductive surfaces.

Preferred
Disciplines: Electrical
Contact Wipe
A wiping action as contact surfaces initially come together and compress, to provide a reliable, low resistance electrical contact.

Regional
Disciplines: Electrical
Contact Wire
A bare solid conductor being the lowest of the two overhead wires mounted directly above the track centreline. The pantographs of electric trains press against the underside of this wire and collect the current required by the train.

Preferred
Disciplines: Electrical, Infrastructure
Contactor
An electromagnetic device, usually a solenoid with tractive armature, which operates heavy duty contacts for controlling high current electrical circuits.

Regional
Disciplines: Electrical
Container
An independent unit either open or fully enclosed designed for intermodal transport of commodities. Intermodal containers are designed with standard corner fittings for positive securing to rail vehicles, road trucks and sea vessels.
container well wagon or container well car: A well wagon specially equipped with approved securing devices for the transport of freight containers.

Preferred
Disciplines: Rolling Stock
Container Flat Wagon
A flat wagon specially equipped with approved securing devices for the transport of freight containers. The wagon may have a full width deck, with or without apertures, or be of skeletal construction.
Also known as a container flat car

Preferred
Disciplines: Rolling Stock
Container Well Wagon
A well wagon specially equipped with approved securing devices for the transport of freight containers.
Also known as a container well car

Preferred
Disciplines: Rolling Stock
Contenary Wire
A bare solid conductor (Contact Wire) installed in lieu of catenary wires at stations, under bridges and at level crossings.

Alternative
Disciplines: Electrical, Infrastructure
Continuity Jumper
Refer Jumper.

Non-preferred
Disciplines: ALL Disciplines
Continuity Test
This is the process whereby the wiring is checked to see that it is in conformity with the wiring diagrams and that all wires are continuous from termination point to termination point. This test is generally carried out simultaneously with a wire count and insulation test.

Regional
Disciplines: Electrical, Train Control
Continuous Welded Rail (CWR)
Track where the rail is joined by welding (and other non-moveable joints such as glued insulated joints) in lengths greater than 300 metres.

Preferred
Disciplines: Infrastructure
Contraction
The shortening of rails under the influence of falling temperatures.

Preferred
Disciplines: Infrastructure
Contractor
Contracting companies, sub-contractors and rail safety workers working for either of these.

Preferred
Disciplines: ALL Disciplines
Contraflexure Turnout
A turnout on a curve where the direction of the turnout diverging move is opposite to the curve.

Preferred
Disciplines: Infrastructure
Control
Operation effecting the working of a function from a distance. By extension, the whole of the gear which effect s its working.

Preferred
Disciplines: Train Control
Control Area
The area of the railway controlled or supervised by a particular signal box or control centre, as defined by the signalling plan.

Regional
Disciplines: Train Control
Control Centre
Refer Network Control

Alternative
Disciplines: Train Control, Operations
Control Circuit
Group of circuits used in electric control.

Preferred
Disciplines: Electrical
Control Device
A lever, switch, signalling panel button, VDU monitor target etc which is operated by the signaller to set points and routes, clear and replace signals and operate other signalling functions.

Preferred
Disciplines: Train Control
Control Indicator
An indicator on the track indicator diagram in signal boxes worked under the track block system. When the signaller at B reverses the accepting lever, the control indicator at A displays a white light indicating that the section from A to the clearing point at B is unoccupied and that B has accepted the train.

Regional
Disciplines: Train Control
Control Lever
Part of the control equipment which is worked manually in order to control a function.

Preferred
Disciplines: Electrical
Control Panel
A panel which incorporates a layout of tracks for the area controlled from the signal box and which contains levers for the control of signals, routes, points, releases, etc. In certain cases, the control panel is combined into the track indicator diagram.

Preferred
Disciplines: Train Control
Control Point
A signal box, including a control centre, gate box or ground frame.

Preferred
Disciplines: Train Control
Control Repeater
An indicator on the track indicator diagram in signal boxes worked under the track block system. When the signaller at B reverses the accepting lever, the control repeater at B will display a green light.

Regional
Disciplines: Train Control
Control Table
A part of the signalling system specification that defines the detail of the signalling controls for each signalling function.

Preferred
Disciplines: Train Control
Controlled Absolute Signal
A signal that is controlled or operated by a network control officer or competent worker. The signal must not be passed at stop without authority.

Preferred
Disciplines: Operations, Train Control
Controlled Automatic Signal
See 'semi-automatic signal' under term Automatic Signal.

Alternative
Disciplines: Train Control
Controlled Level Crossing
A level crossing with active warning operated under supervision and interlocked with protecting signals. It may be monitored by closed circuit television (CCTV) where the level crossing is out of sight of the controlling signal box.

Regional
Disciplines: Train Control
Controlled Location
A location where a network control officer controls the signalling and safeworking operations either on-site or remotely.

Preferred
Disciplines: ALL Disciplines, Train Control
Controlled Signal
A signal that is, or may be, controlled or operated by a network control officer or competent worker.

Preferred
Disciplines: ALL Disciplines, Train Control
Controlled Signal Blocking (CSB)
Refer 'Absolute Signal Blocking' (ASB)

Non-preferred
Disciplines: Operations
Controlled Signal Working Automatically
A control function that enables a controlled signal to work automatically. Also see Automatic Reclearing.

Regional
Disciplines: Train Control
Controlled Speed
Controlled speed is a speed that allows rail traffic to stop short of an obstruction within half the distance of clear line that is visible ahead.

Preferred
Disciplines: Operations
Conventional Wheelset
A wheelset having two wheels interference fitted to the axle and two outboard bearings.

Preferred
Disciplines: Rolling Stock
Converging
(Lines) meeting and joining to become one line.

Preferred
Disciplines: Operations, Train Control
Converse Locking
The provision of locking between functions to ensure that conditions cannot be broken down, that is if 1 locks 2, then 2 must lock 1. This form of locking is provided automatically by mechanical interlocking. Also known as Reciprocal Locking.

Preferred
Disciplines: Train Control
Alternate Term: Reciprocal Locking
Convoy
A group of track vehicles not coupled but travelling closely together under a single occupancy authority.

Preferred
Disciplines: Operations, Rolling Stock
Correlation
The comparison of the configuration and version status of a system with the design records to ensure that the two are in agreement.

Preferred
Disciplines: ALL Disciplines
Correspondence
The agreement of the Interlocking with the detected state of a signalling function.

Preferred
Disciplines: Train Control
Correspondence Proving
Checking which ascertains that an apparatus is in the position corresponding to its controlling lever or switch.

Preferred
Disciplines: Train Control
Correspondence Test
This is a through test to verify that a function is in correspondence with its respective controlling equipment and/or indicating equipment. It includes an out of correspondence test to prove that if the function does not fully respond this is detected.

Preferred
Disciplines: Electrical
Corridor
The term corridor refers to capital city to capital city legs. For example, Perth - Sydney freight travels on the Adelaide-Perth corridor and the Sydney-Adelaide corridor. This is the preferred term to the traditional 'Up' and 'Down' trains used by state-based systems.

Preferred
Disciplines: ALL Disciplines
Counter Conditional Locking
Interlocking which prevents a condition (upon which other interlocking is dependent) from being destroyed.

Preferred
Disciplines: Train Control
Counting Head
Wheel presence detection equipment that is fixed to the rail. Each counting head assembly consists of two counting heads and determines the number and direction of axles passing it.

Preferred
Disciplines: Train Control
Coupler
The mechanism for joining two rail vehicles together.

Preferred
Disciplines: Rolling Stock
Coupler Carrier
The horizontal bracket on the headstock of the rolling stock which supports the coupler shank.

Preferred
Disciplines: Rolling Stock
Coupler Head Shelf
A horizontal ledge which is part of the coupler head which limits the relative vertical movement between the couplers.

Preferred
Disciplines: Rolling Stock
Coupler Height
The height measured from the top of rail to the centre of the knuckle of an automatic coupler or to the horizontal centre line of the shank of a drawbar.

Preferred
Disciplines: Rolling Stock
Coupler Lighting
Lighting of inter-vehicle coupling equipment.

Preferred
Disciplines: Rolling Stock
Cow Catcher
An extension of vehicle body underneath the headstock at a cab end to deflect large obstacles from the track.
Also known as an Obstacle Deflector or Pilot.

Preferred
Disciplines: Rolling Stock
Crank
A lever, the arms of which forms an angle, which pivots around an axis and is used to transmit motion from one rod to another rod.

Preferred
Disciplines: Train Control, Infrastructure
Crank Handle
A portable handle for insertion in point machines to enable them to be operated manually.

Preferred
Disciplines: Train Control, Operations
Crash Emergency Management System
A system integrated into a vehicle body design for controlling the energy absorbed, deceleration and structural deformation during crashes, in particular collisions.

Preferred
Disciplines: Rolling Stock
Creep (rail)
The permanent or progressive longitudinal movement of rails in track caused by expansion or contraction of the rail or the action of traffic.

Preferred
Disciplines: Infrastructure
Creep Monument
A permanent monument located at the side of the track (i.e. in the cess or the six foot) to facilitate the accurate measurement of rail creep. Measurements are taken between a marker on the monument and punch marks made on the side of the rail head.

Preferred
Disciplines: Infrastructure
Creep Signals
Alternative term for Loading / Unloading Indicators.

Regional
Disciplines: Train Control
Crib Crossing
A crossing of tracks with fencing arranged to orientate pedestrians to look in both directions before crossing the tracks. These crossings are usually only provided with passive protection.

Preferred
Disciplines: Infrastructure
Critical Design Stress
In structural design, it is usually taken as either the yield stress, 80% of the ultimate stress or the critical buckling stress whichever is less.

Preferred
Disciplines: Rolling Stock
Critical Speed
The lowest speed at which hunting is demonstrated. Can also be used to describe speed at which a resonant response occurs with cyclic track irregularities.

Preferred
Disciplines: Rolling Stock, Infrastructure
Cross
To go past other rail traffic travelling in the opposite direction.

Preferred
Disciplines: ALL Disciplines
Cross Bond
A jumper cable cross-connecting the common rails or centre points of Impedance bonds of parallel tracks to form a mesh of alternate paths for traction return current.

Preferred
Disciplines: Electrical
Cross Level
The difference in level of the two rails in a track. Also known as Superelevation or Cant.
Generally, the term cant or superelevation is used for intended height difference in the rails (i.e. where the track is inclined in a curve), and the term cross-level is used for unintended height difference (i.e. due to track irregularity).

Preferred
Disciplines: Infrastructure
Alternate Term: Superelevation or Cant
Cross Level Variation
1. The variation of the actual cross-level at one track position from the design cross-level at that position;
or
2. The variation in actual cross-level at two longitudinally separated positions along the track in order to determine track twist.

Preferred
Disciplines: Infrastructure
Cross-arm
A timber arm, usually fastened at right angles to an electrical service pole, designed to carry the pins and insulators to which aerial line wires may be attached. The line wires are conductors for an electrical circuit e.g. signalling circuit, telecommunications circuit.

Preferred
Disciplines: ALL Disciplines, Electrical
Crossing
A track component that enables a wheel travelling along one rail to pass through the rail of a track which crosses its path. The most common types are 'V' and 'K'. Sometimes called the Frog.

Preferred
Disciplines: Infrastructure
Crossing Angle
The angle of approach between the two roads of a turnout or diamond crossing.

Preferred
Disciplines: Infrastructure
Crossing Location
May consist of single or double ended portion of track, to hold rail traffic, connected to a main line that is used to permit other rail traffic to cross or pass.

Preferred
Disciplines: ALL Disciplines, Operations
Crossing Loop
A length of track connected to the main line by switches at both ends to provide a facility that permits trains to both cross and pass each other.

Preferred
Disciplines: ALL Disciplines, Operations
Crossing Movement
A movement which allows trains travelling in opposite directions on single tracks to go past each other at a station.

Preferred
Disciplines: ALL Disciplines, Operations
Crossing Number
Crossings may be designated by a number which refers to the cotangent of the splay angle or rate of slope (commonly referred as angle).

Preferred
Disciplines: Infrastructure
Crossingwork
An item of trackwork such as a crossing or set of points.

Preferred
Disciplines: Infrastructure
Crossingwork Assembly
An assembly of crossingwork (e.g. points and crossings), including lead rails, making up a complete layout (e.g. turnout or crossover).

Preferred
Disciplines: Infrastructure
Crossingwork Layout
An assembly of crossingwork and lead rails providing a track crossing or turning out function.

Preferred
Disciplines: Infrastructure
Crossover - Track
A portion of line that is used to divert rail traffic from one continuing line to another.

Preferred
Disciplines: ALL Disciplines
Crossover - Train Crews
Crew from a pair of trains heading in opposite directions swap so that the crews finish their shift from where they started (generally applies to long distance rail).

Alternative
Disciplines: Operations
CSB
Controlled Signal Blocking

Refer to Absolute Signal Blocking (ASB)

Preferred
Disciplines:
Related Term: Absolute Signal Blocking (ASB)
CSR
Cab Secure Radio

Alternative
Disciplines: Operations, Rolling Stock
CTC
Abbreviated term for 'centralised traffic control'.

Centralised Traffic Control (CTC)

Preferred
Disciplines: Train Control, Operations
Cubic/dense
Cubic and dense relates to the type of freight being moved. The two form the ends of the scale with respect to the weight to space ratio. Freight which is heavy for the amount of space it consumes, such as beer or pavers, is referred to as dense. Freight that is light for the amount of space it consumes, such as potato chips or white goods, is referred to as cubic. Cubic freight is generally carried in taller and longer containers, such as 12.2m and 14.6m while dense freight is usually carried in shorter 6.1m containers or half height containers.

Preferred
Disciplines: Operations
Curtain Side Wagon Or Car
A box car in which the side walls consist entirely or predominantly of weatherproof flexible panels.

Preferred
Disciplines: Rolling Stock
Curve
A track with a continuous change in direction of alignment by means of an arc.

Preferred
Disciplines: Infrastructure
Curve Throw
The extent to which a transverse cross-section of a vehicle is displaced inwards or outwards from the track centreline on a horizontal curve, or upwards and downwards on a vertical curve.

Preferred
Disciplines: Infrastructure
Cut Section (line Circuit)
The sectioning of line circuits to avoid exceeding the maximum length allowed, for instance, in a.c. electrified territory.

Regional
Disciplines: Electrical
Cut Section (track Circuit)
A method of reducing the continuous length of a track circuit by the use of individual track circuits, but indicated as a single track section on the signallers panel.
Also known as 'multi-section track circuit'.

Regional
Disciplines: Electrical, Electrical
Cut Track (track Circuit)
A track circuit which has its feed open circuited by the
front contacts of the next track relay ahead so that the treack circuit cannot pick up until the next track circuit picks up.

Regional
Disciplines: Electrical, Electrical
CWR
Abbreviated term for 'continuous welded rail'.

Continuous Welded Rail (CWR)

Preferred
Disciplines: Infrastructure