Absolute Block
A block that may be occupied by only one train at a time.
Absolute Signal ...
Absolute Block
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
A block which a train is not permitted to enter while it is occupied by another train.
Absolute Signal ...
Absolute Block A section of track protected by signals into which only one train at a time is permitted.
Absolute Block A block that, by design, must not be occupied by more than one train. Accident An unforeseen event or occurrence, which results in injury or property damage.
The principle of the British absolute block system of railway signalling is to facilitate the safe operation of a railway by preventing more than one train from occupying a defined section of route at the same time.
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An absolute block allows for only train to occupy the block. Clear is a block clear of opposing and following trains and occupied is a block clear of opposing, but not necessarily preceding trains.
This system would be used at terminus stations to allow a locomotive to enter a platform already occupied by coaching stock, but would normally be used on through lines only when one goods train is following another. (see also absolute block).
Staff - Wooden stick which must be carried by each train traveling on single line section of railway branch line to maintain absolute block working and prevent possibility of head-on collision.
 See also: Track, Block, Train, Operation, Point
  
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