Signal aspect
The appearance of a lineside or cab signal.
Signal indication ...
Signal Aspect
The appearance of a fixed signal conveying an indication as viewed from the direction of an approaching train, or the appearance of a cab signal conveying an indication as viewed by an observer in the cab.
Signal Box ...
Signal Aspect The signal appearance, which conveys an indication as viewed either (1) from the direction of an approaching train, or (2) on the cab signal display unit in the engine control compartment.
Automatic Cab Signal System (ACS) (US) A system that automatically operates a display of signal aspects in the cab of a train as well as the cab warning whistle.
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.
However, I'm informed that in Sweden a balise is a device used to send information to a train about speed limits and signal aspects.
Banker
RAILWAYS. An additional locomotive used to assist a train in climbing a gradient.
A signal aspect is what the signal actually displays, and a signal indication is what the signal aspect tells you to do. For example, you are approaching a flashing-yellow-over-red signal--that is the “aspect.
The action required by a signal aspect.
Signboard
Information stenciled on side of car pertaining to empty car movement instructions.
 See also: Aspect, Train, Signal, Track, Timetable
  
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