Original Instructions for the No. 454 Marx Automatic Block Signal
1) Refer to the diagram.
2) Place signal beside track facing direction of traffic.
Automatic block signaling. See Signal, automatic block.
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Backfill. Material placed adjacent to an abutment, pier, retaining wall or other structure or part of a structure to fill the unoccupied portion of the foundation excavation.
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.
86 In automatic block signal territory, unless otherwise provided, an inferior train must clear a first class train or train of superior right in the same direction so as to avoid giving a restrictive indication to the following train.
Automatic Block Signal System. Signal system that uses automatic block signals, cab signals, or both.
Adhesion factor ...
Automatic Block Signaling
1. A system in which signals are operated automatically by a train, a broken rail, an open switch, a car standing on a turnout fouling the main track, etc.
2.
Automatic Block Signal
A trackside signal activated by the movement of trains over/past a detecting device.
Automatic Coupler ...
Automatic Block Signal
(ABS) A block signal which is activated by track circuit or in conjunction with interlocking or controlled point circuits. This block signal automatically indicates track condition and block occupancy.
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 Signaling
An Automatic Block Signaling (ABS) system is an automatic signaling system that ensures the protection of following trains traveling in a signaled direction.
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.
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 ...
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".
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.
A waterway bed protection consisting of timber, concrete, riprap, paving or other construction placed adjacent to substructure abutments and piers to prevent undermining by scour. Also placed at the ends of pipes and culverts.
Automatic block ...
 See also: Block, Block Signal, Track, Signal, Train
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