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Block
A length of track of defined limits, the use of which is governed by block signals, block-limit signals, automatic speed control or any combination thereof.
Absolute Block
A block between block systems, block limit systems, interlockings or any combination thereof which must not be occupied by more than one train except as provided by the rules.
Automatic Block Signal System
A block singal system wherein the use of each block is governed by an automatic block signal, the cab signal indicator or both.
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