Glossary of Terms


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V Crossing
A crossing comprising a nose and two wings.

Preferred
Disciplines: Infrastructure
V End (crossing)
The end of a crossing which resembles a V. On a fabricated crossing it is the open end of the nose and scarf rails.

Preferred
Disciplines: Infrastructure
V Nose (points)
Points design where the toe of the switch is machined like an inverted letter 'V'. The design permits the switch toe to fit into machining of the head of the stock rail

Preferred
Disciplines: Infrastructure
V/Line Network
Victorian regional network.

Preferred
Disciplines: ALL Disciplines
Validation
Confirmation that the particular requirements for a specific intended use are fulfilled.

Preferred
Disciplines: ALL Disciplines
VDU
Visual Display Unit


Disciplines:
Vehicle
Used to denote rail vehicles where reference to a specific type or class is not required or not intended.

Preferred
Disciplines: Rolling Stock, Operations
Verification
Testing and evaluation of an item of equipment or a system to assure compliance with its specification or other requirements.

Preferred
Disciplines: ALL Disciplines
Vertical Alignment
Refer to Alignment.

Preferred
Disciplines: Infrastructure
Related Term: Alignment
Victorian Broad Gauge Network
Victorian regional and Melbourne metropolitan broad gauge networks.

Preferred
Disciplines: ALL Disciplines
Victorian Network
Victorian regional and Melbourne metropolitan broad gauge networks.

Preferred
Disciplines: ALL Disciplines
Victorian Standard Gauge Network
Victorian regional non-interstate standard gauge network.

Preferred
Disciplines: ALL Disciplines
Vigilance System
A system that will react by directly initiating an emergency brake application if an acknowledgment input is not received within a specified time increment.

Preferred
Disciplines: Rolling Stock, Operations
Visibility Lights
Lights, fitted below the headlights, to improve rolling stock's ability to be seen and to assist the crew in viewing of the immediate area in front of the vehicle.
Also known as 'ditch lights' or 'crossing lights'.

Preferred
Disciplines: Rolling Stock, Operations
Visual Display Unit (VDU)
Terminal device with a screen on which text and graphics can be displayed. Used as an I/O (input/output) device in conjunction with a keyboard or a mouse for interactive computing.

Regional
Disciplines: Train Control
Vital
Signalling equipment and circuits are considered vital where failure to function correctly could cause an unsafe outcome either directly or together with another signalling equipment or circuit failure. Vital signalling equipment is equipment whose safe operation is fundamental to the safe operation of the signalling system. Equipment for use in this mode should have been designed to ensure that it will not fail in an unsafe manner. This may well involve designing it in such a way that should it fail it will fail in a predetermined state which does not lead to an unsafe situation. Such equipment is termed Fail-safe.

Preferred
Disciplines: Train Control
Vital Blocking
Blocking which is incorporated in the interlocking apparatus and uses vital equipment to prevent the operation of particular signalling apparatus. Operator controls to apply blocking are independent of controls to remove the blocking.

Preferred
Disciplines: Train Control