Glossary of Terms


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

Magnetic Latch Relay
A relay, the armature of which remains at full stroke in its last energised position when its control circuit is opened.

Regional
Disciplines: Electrical
Main Arm
An arm of a semaphore main signal controlling a running movement.

Regional
Disciplines: Train Control
Main Aspect
An aspect displayed by a colour light or semaphore signal controlling a running movement.

Regional
Disciplines: Train Control
Main Cable
A twin or multicore lineside cable carrying signalling functions or power supplies between apparatus cases or equipment rooms.

Preferred
Disciplines: Train Control
Main Line
The running line normally used for running rail traffic through and between locations

Preferred
Disciplines: ALL Disciplines, Operations
Main Line Indicator
Wayside Indicators provided in train order working territory to indicate to a driver travelling on the authority of train order, that the interlocking equipment, such as points and level crossings, are set for the train to proceed.

Regional
Disciplines: Train Control, Operations
Main Signal
A colour light signal capable of displaying a main aspect or a semaphore distant or stop signal.

Overseas
Disciplines: Train Control
Maintainer's Panel
An indication panel that repeats the indications sent to the Signaller and allows the maintainer to monitor the state of the interlocking. It generally contains additional fault condition indications.

Overseas
Disciplines: Train Control
Maintainer's Terminal
This commonly consists of a VDU, keyboard and printer, and is used to obtain essential fault diagnostic information.

Overseas
Disciplines: Train Control
Maintenance Provider
An organisation contracted to perform maintenance on infrastructure or rolling stock.

Preferred
Disciplines: ALL Disciplines
Maintenance Releases
A releasing switch provided on bi-directionally signalled double lines to enable maintenance staff to block the section for signalling movements in the reverse direction.

Regional
Disciplines: Train Control
Maintenance Representative
An authorised Rail Infrastructure Manager's employee or an organisation contracted to the Rail Infrastructure Manager, responsible for maintaining network infrastructure.

Preferred
Disciplines: ALL Disciplines
Major Accident
An occurrence that has been classified as a major emergency, requiring a sustained response by emergency service personnel, e.g.: a collision or major derailment involving a passenger or freight train which results in multiple deaths/injuries and response by emergency service personnel.

Preferred
Disciplines: ALL Disciplines
Major Derailment
All derailments exceeding the limits defining minor derailment.

Preferred
Disciplines: ALL Disciplines
Major Incident
An incident assessed by the Rail Infrastructure Manager or delegate as having a potentially major impact on the Network, human life, property or the environment.

Preferred
Disciplines: ALL Disciplines
Male Half (crossing)
Refer to Scarf Rail.

Non-preferred
Disciplines: Infrastructure
Related Term: Scarf Rail
Manifest
A complete list of the units (containers) being carried by a service on a given date, itemised by the wagons on which they are being carried.

Preferred
Disciplines: ALL Disciplines, Operations
Manual Block Working
A method of special working which ensures sole occupancy by manually maintaining the block behind a rail traffic movement.

Regional
Disciplines: Train Control, Operations
Manual Points Control Mechanism
A device used for the manual control of points. Includes ESML handle, crank handle and handthrow point lever.

Preferred
Disciplines: Operations, Infrastructure
Manual Train Order Working (MTOW) Territory
The portions of line where the Manual Train Order Working system of Safeworking is used.

Preferred
Disciplines: Train Control, Operations
Mark Off
Identify wagon with a mechanical defect.

Legacy
Disciplines: Rolling Stock
Marker Light
Light indicating the front of a train.

Preferred
Disciplines: Rolling Stock, Operations
Marker Light Signal
A small light fixed to a single light colour light signal post for the purpose of indicating the location of a signal in the event of the main signal light having failed. Off-set to the right on an automatic signal and directly underneath the main signal on a controlled signal.

Regional
Disciplines: Train Control
Marshal
To arrange the order of vehicles in a train's consist.

Preferred
Disciplines: ALL Disciplines, Operations
Marshalling Irregularity
An irregularity in marshalling of a train, for example, not in accordance with the Dangerous Goods code.

Preferred
Disciplines: Operations
Marshalling Yard
A train yard where shunting is performed as well as the stabling, light maintenance, inspection, and queuing of trains.

Preferred
Disciplines: ALL Disciplines, Operations
Master Roster
The planned roster that would operate if there were no operational or crewing changes. It contains all work allocated to a depot. The work is formulated into shifts and arranged into work lines.

Preferred
Disciplines: Operations
Master Train Plan
Planned trains to fulfil planned transit legs. The train details include the route and timetable, the freight capacity, planned transit legs, fuelling stops, wagon attach

Preferred
Disciplines: Operations, Rolling Stock
Material Change
Where a proposed change to an accredited rail organisation accredited activities and/or safety management system which may be reasonably expected to impact upon safety, or have the potential to do so.

Preferred
Disciplines: ALL Disciplines
Material Safety Data Sheet (MSDS)
A document that provides information on the identification, hazards, precautions for use and safe handling of a specific product.

Preferred
Disciplines: ALL Disciplines
Maximum Service Mass
Represents the mass of the vehicle in full working order (includes passengers and / or crew).

Preferred
Disciplines: Rolling Stock
Maximum Track Speed
The speed displayed on speed boards or in-cab signalling equipment (DMI).

Preferred
Disciplines: Operations, Rolling Stock
May
Indicates the existence of an option.

Preferred
Disciplines: ALL Disciplines
MCS
Multiple Car Set


Disciplines:
Mechanical
Operated without any form of power assistance.

Preferred
Disciplines: ALL Disciplines
Mechanical Insulated Joint
A mechanical joint incorporating insulating channels, ferrules and end posts designed to electrically insulate the joined rails.

Regional
Disciplines: Infrastructure, Electrical
Mechanical Interlocking
An interlocking area where the points and signals are directly connected by wires and rods to the levers of a mechanical interlocking machine and are operated by the signaller or other qualified employee.

Regional
Disciplines: Infrastructure, Electrical
Mechanical Point Indicator
A device mechanically actuated by a lever, or a points switch, to indicate the position of the points

Regional
Disciplines: Train Control, Operations
Mechanical Rail Joint
A rail joint made by mechanical means (as opposed to welding), generally using bolted fishplated sliding joints that are designed within limits to allow the rail to expand and contract with temperature.

Preferred
Disciplines: Infrastructure
Mechanically Jointed Rail Track
Track where the rail less than 110 metres in length is joined by mechanical rail joints.

Preferred
Disciplines: Infrastructure
Metal Flow
Extrusion or flow of steel on the running surface of the rail head.

Preferred
Disciplines: Infrastructure
Micro-switch
An electrical contact, usually sealed, with a snap-action, very short changeover movement activated by a plunger.

Preferred
Disciplines: Electrical
Mid-platform Signal
A Signal provided to enable two trains to be positioned at a platform by the use of block Signalling techniques. It may or may not form part of the standard aspect sequence.

Overseas
Disciplines: Train Control
Migration
the changeover process in time from one technology to another

Preferred
Disciplines: ALL Disciplines
Miniature Lever
Electrical control switches within relay interlocking control units.

Regional
Disciplines: Electrical
Miniature Lever Frame
A lever frame of miniature levers for the control of power operated signalling.

Overseas
Disciplines: Electrical
Refer to Power Frame.
Alternative
Disciplines: Electrical
Related Term: Power Frame
Minimum Static Height
The case of a stationary vehicle fitted with condemned diameter wheels combined with the suspension fully compressed to 'solid' condition, maximum permissible wear in bogie centre plates, pivots or any other surface which may reduce the height of the bogie or vehicle, body deflection under load and including fully deflated airsprings, where applicable.

Preferred
Disciplines: Rolling Stock
Minor Derailment
Rolling stock derailed for less than sixty (60) metres and less than sixteen (16) kilometres per hour.

Preferred
Disciplines: Rolling Stock
Minor Incident
A minor occurrence that can be managed without external assistance from emergency service personnel, e.g. derailments; minor injuries, etc.

Preferred
Disciplines: ALL Disciplines
Review along with 'Major' and Incident
Alternative
Disciplines: ALL Disciplines
Misconsign-ment
Freight that is dispatched to an incorrect destination.

Regional
Disciplines: Operations
Mixed Gauge Turnout
A turnout consisting of two or more track gauges where one or more gauges diverge. A turnout in which all gauges diverge is called a full mixed gauge turnout.

Preferred
Disciplines: Infrastructure
Mobile Radio
A radio mounted in a locomotive, track machine or terminal machinery and has an externally mounted antenna. A mobile radio usually puts out a stronger signal than a portable radio.

Preferred
Disciplines: ALL Disciplines, Operations
Modified Continuity Test
Performed by examining staff or train crew when locomotives are changed or loading is detached consisting of a continuity test.

Preferred
Disciplines: Operations
Modified Or Partial Train Examination MX
Performed by examining staff or train crew when attaching pre-air tested and pre-mechanically examined vehicles to a locomotive or train. A maximum of two separate blocks may be placed within a train consist at any location consisting of - brake pipe leakage test; continuity test; issue of train examiners certificate for interstate freight trains (if the examination is performed by a train examiner).
Review to combine mods and partials into one common definition

Regional
Disciplines: Operations
Modified Or Partial Train Examination MX1
Performed by examining staff or train crew when attaching non tested loading to a previously tested train or when vehicles on an existing train are remarshalled consisting of - brake pipe leakage test; continuity test; issue of train examiners certificate for interstate freight trains (if the examination is performed by a train examiner).

Regional
Disciplines: Operations
Modified Or Partial Train Examination MX2
An air brake examination that confirms the correct brake operation on the first three vehicles beyond the further most amalgamation point when a locomotive/s or vehicles are attached or detached from a train.

Regional
Disciplines: Operations
Modified Rolling Stock
Rolling stock where a change has been implemented that affects it's compliance with the requirements in the standard.

Preferred
Disciplines: Rolling Stock
Monorail Network
A passenger-carrying system in which vehicles travel over a single broad beam (rather than two narrow rails connected by sleepers as with conventional railway rolling stock).

Preferred
Disciplines: ALL Disciplines
MOT
Ministry of Transport


Disciplines:
Abbreviation for 'Ministry of Transport'.
Alternative
Disciplines: ALL Disciplines
Motion Sensing Detector
A device used to sense the presence, motion and direction of travel of a train.

Preferred
Disciplines: ALL Disciplines
Motive Power Unit
A rail vehicle used to provide the power to move itself or other vehicles.

Preferred
Disciplines: ALL Disciplines
Motor Car Carrier
A rail vehicle specially equipped for the transport of private and light commercial motor vehicles.

Regional
Disciplines: Rolling Stock
Motor Operated
Power operated by a motor or similar device connected to the signal arm (applicable to semaphore signals). Can also apply to points.

Overseas
Disciplines: Train Control
Motorail
A rail based trailer for the movements of cars.

Preferred
Disciplines: Rolling Stock
Movable Roundel Light Unit (searchlight)
Light unit in which the aspect is given by means of a mechanism placing a roundel of the colour required near the focus of the lens unit, in front of the lamp.

Preferred
Disciplines: Electrical
Movement
The operation on rail of rail traffic .

Preferred
Disciplines: ALL Disciplines
Movement Authority
Permission for rail traffic to run to a specific location as a signalled move.

Overseas
Disciplines: Train Control
Refer Proceed Authority
Alternative
Disciplines: Train Control
Moving Block
A train separation system where a safe space is maintained ahead of a moving train commensurate with its speed relative to other trains, track and train characteristics.

Regional
Disciplines: Train Control, Operations
MSDS
Material Safety Data Sheet


Disciplines:
MTOW
Manual Train Order Working


Disciplines:
Multi Function Coupler
Coupler which makes all connections between the rail vehicles (mechanical, pneumatic and electrical) without human intervention, in contrast to automatic couplers which just handle the mechanical aspects.

Preferred
Disciplines: Rolling Stock
Multiple Car Set (MCS)
Two or more compatible and easily separable single unit vehicles coupled together to form an operating consist. A MCS may include all powered vehicles or a combination of powered and trailer vehicles.

Regional
Disciplines: Rolling Stock
Multiple Coupled Locomotives
Where locomotives are multi-coupled, one crew is in control of, and operating, more than one unit, employees must regard the multi-coupled locomotives, for the purpose of train signalling and operation as one locomotive.

Preferred
Disciplines: Rolling Stock, Operations
Multiple Unit
Term could refer to:
1. When two or more locomotives are coupled in such a manner that all the units are controlled by the driver from one control stand - usually in the leading locomotive; or
2. A multiple-unit passenger train in which the propulsion power is supplied by a diesel engine (see 'DMU') or by electric power supplied from an external source such as overhead wires (see 'EMU').

Preferred
Disciplines: Rolling Stock, Operations
Multiple-aspect Signalling
A fixed colour light signal capable of giving three or more aspects.

Regional
Disciplines: Train Control
Multiple-gauge Track
Track that allows rail traffic of different gauges to transit using a common rail

Preferred
Disciplines: ALL Disciplines, Infrastructure
Must
The word Must indicates that a statement is mandatory.

Preferred
Disciplines: ALL Disciplines