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Definition of Absolute block

Absolute block Definition from Business & Finance Dictionaries & Glossaries
BTS Transportation Expressions
A block in which no train is permitted to enter while it is occupied by another train. (49CFR218)
By the Bureau of Transportation Statistics.
Railroad-Related Terms
A length of track in which no train or engine is permitted to enter while it is occupied by another train or engine.
Absolute block Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
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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