Automatic Block Signal System

Automatic Block Signal System (ABS)
A series of consecutive blocks whose use is governed either by train actuated block signals or by certain conditions affecting the use of a block.

Automatic Block Signal System. Signal system that uses automatic block signals, cab signals, or both.
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Automatic Block Signal System (ABS)
A block signal system wherein the use of each block is governed by an automatic signal.
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Automatic block signal systems normally overrode the requirements of rule 99. If you have two block signals, a block and an interlocking signal or a block and distant signal to the rear, you are not required to afford flag protection.

ARU American Railway Union, Crushed during the Pullman strike in 1894 Automatic Block Signal System (ABS) A series of consecutive blocks governed by block signals, cab signals or both, actuated by a train, ...

Automatic Block Signal System (ABS) A series of consecutive blocks governed by block signals, cab signals or both, actuated by a train, engine or by certain conditions affecting the use of a block.

See also: Track, Crew, Operation, Engine, Block