Railroad Definitions
Below are the Definitions showing in the 7th Edition of GCOR Effective April 1, 2015.
ABS See Automatic Block Signal System.
Absolute Block A length of track that no train is permitted to enter while the track is occupied by another train.
Absolute Signal A block or interlocking signal without a number plate, or designated by an A marker.
ACS See Automatic Cab Signal System.
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