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Absolute Block

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Absolute block signalling
Absolute block signalling is a British signalling scheme designed to ensure the safe operation of a railway by allowing only one train to occupy a defined section of track (block) at any time. This system is used on double or multiple lines where use of each line is assigned a direction of travel.

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BTS Transportation Expressions Dictionary

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Absolute Block
A block in which no train is permitted to enter while it is occupied by another train. (49CFR218)