When the Block Signal lights are turned to red, the control zone will not receive current, and the train will stop when it reaches the insulated section of track called the control zone.
Fixed block signal
Most blocks are 'fixed' blocks, i.e. they delineate a section of track between two defined points. On timetable, train order, and token-based systems, blocks usually start and end at selected stations.
Block signal
A signal at the entrance to a block (See Block) indicating whether the block is occupied by a train.
Bolster ...
Block signal
Lineside signal placed at the beginning of a block that governs the use of that block. See also Automatic Block Signal.
Block station ...
Block Signals
A signal or series of signals, usually automatic, which control a block.
Board ...
Block Signal
A fixed signal displayed to trains at the entrance of a block to govern use of that block.
Block System ...
"A block signal system whose indications supercede the superiority of trains in both following and opposing movements on the main track." ...
Automatic block signals are block signals which are joined by electrical circuits to provide a signal indication.
Automatic block signal
A signal controlling the entrance to an automatic block.
Automatic Train Control (ATC) ...
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.
Absolute Permissive Block (APB) A designated section of track or tracks within which the movement of trains will be governed by block signals, whose indications supersede the superiority of trains.
Automatic Block Signal A block signal that is activated either by track circuit or in conjunction with interlocking or controlled point circuits. This block signal automatically indicates a track condition and block occupancy.
Automatic Block Signal (ABS) A train control subsystem based on a series of consecutive blocks governed by block signals which are controlled by the movement of trains and certain other conditions (e.g., detection of level crossing closure) rather ...
This method will obviously not be able to trigger the green and red lights of a block signal properly, but it will work on gatemen, crossing gate, semaphores and other on/off signals.
Cab Signal A signal located in engineer's compartment or cab, indicating a condition affecting the movement of a train or engine and used in conjunction with interlocking signals and in conjunction with or in lieu of block signals.
A length of track of defined limits, the use of which is governed by block signals or by some other type of signaling.
Block signal. A fixed signal at the entrance to a block, to govern trains and engines entering and using the block.
Block station.
Signal aspect: The information conveyed to a railroad vehicle operator by a block signal. Signals may use colored lights, position-significant lights or mechanical semaphores to generate various aspects.
The signals described in this document are all Block Signals, i.e. they govern trains entering the following Block. A Block is the line between two consecutive Block Signals.
Automatic Block System, or Automatic Block Signal (ABS)
RAILWAYS. A train control system. I believe that ABS is a relatively primitive system compared with CTC and CTS.
Automatic Route
RAILWAYS. See "Fleeting".
OVERLAP"Where two block signals control the same stretch of track OWL-Streetcar or train that runs late at night; almost anything having to do with night
PADDLE"Semaphore signal ...
Automatic block
A block section in which operation of the signals is fully controlled by track circuits.
Automatic block signal
A signal controlling the entrance to an automatic block.
Auxiliary signal
Early name for a distant signal.
The circuit requires no adjustment and indicates the direction the train is traveling and can provide a steady state output for controlling block signals and interlocks.
General Purpose Block Occupancy Detector ...
Block Signal - Indicates whether block is occupied or not.
Board - A fixed signal or marker.
Bobber - A short four-wheeled caboose.
 See also: Block, Track, Signal, Train, Switch
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