Advanced Starting Signal

In Block SignallingA system of controlling rail traffic defined by Block Sections. Normally only one train is permitted in a Block Section., a Stop SignalAny Signal capable of showing a Danger Aspect. beyondIn relation to equipment on or alongside the track, positioned such that a train reaches it after passing another defined item of equipment. […]

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AHB

Obsolete abbreviation for Automatic Half-BarrierA Barrier for closing the entrance to a Level Crossing to the oncoming road traffic, whilst maintaining open the exit from the crossing. CrossingA cast or fabricated portion of the track layout which enables the rails of the two tracks to cross each other, while still providing support and guidance for […]

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AHBC

Abbreviated term for Automatic Half-BarrierA Barrier for closing the entrance to a Level Crossing to the oncoming road traffic, whilst maintaining open the exit from the crossing. CrossingA cast or fabricated portion of the track layout which enables the rails of the two tracks to cross each other, while still providing support and guidance for […]

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Alias Plate

A plate which indicates the radio identificationThe act of identifying. number for a SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed., in cases where this differs from the Signal NumberThe number associated with a Signal for identification..

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Aligning (a Signal or Element)

The process of re-directing the Beam Centre-Line of the device to pass through the Alignment PointA spatial reference point, through which the Centre-Line of the Beam emitted by a Signal or Element should be directed, so as to achieve satisfactory Visibility….

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Alignment Point

A spatial reference point, through which the Centre-Line of the Beam emitted by a SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. or Element should be directed, so as to achieve satisfactory Visibility. The Alignment PointA spatial reference point, through which the Centre-Line of […]

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Alignment Target

A physical object used during the Aligning process to mark the Alignment Point.

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