1_Blocks_and_Block_Signals-TAB

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Last updated 11:50 PM on 9/23/26
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9 Terms

1
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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.
2
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Absolute Block
A block established between block stations block limit stations interlockings or any combination thereof which must not be occupied by more than one train except as provided by the rules.
3
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Automatic Block Signal System
A block signal system wherein the use of each block is governed by an automatic block signal the cab signal indicator or both.
4
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Block Signal System
A series of consecutive blocks.
5
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Manual Block Signal System
A block signal system wherein the use of each block is governed by block signals controlled manually by block limit signals or both upon information received by telephone radio or other means of communication.
6
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Block Limit Signal
A fixed signal indicating the limit of the block the use of which is governed by manual block signal system rules.
7
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Block Signal
A fixed signal or a hand signal in the absence of a fixed signal at the entrance to a block that governs trains using that block.
8
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Block Limit Station
A place at which a block limit signal is displayed.
9
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Block Station
A place at which manual block signals are displayed.