Signal indication
The information conveyed by the signal aspect, which the train crew must act on.
Single-line haul ...
A signal indication which authorizes a train to proceed.
Clerestory Roof
Raised center portion along the length of a roof of certain passenger cars featuring "clerestory windows" along the sides to allow natural light into the car.
A signal indication displayed to advise that no train orders are being held (also see Board).
Clearance or Clearance Limit ...
A sample of NORAC signal indications and their meanings.
Instructions regarding the handling of hazmat cars, and how to recognize certain hazardous placards.
Sometimes used to denote a clear signal indication. COFC Container on flat car. Referred to in intermodal traffic. Color Light Signal A fixed signal in which the indications are given by the color of a light only.
Cab Signalling A system where signal indications are displayed to the driver in his cab, usually from a trackside induction system. Cab signals may either augment existing lineside signals or replace them.
Semaphore signals have been largely replaced by modern coloured light signals and in-cab signal indications.
Even though these trains must comply with rules for entering ABS or CTC tracks, the risk of misunderstanding each others intentions, and misjudging who's moving under signal indication and who's moving at Restricted Speed is much higher than outside ...
These display signal indications through patterns of lights in the locomotive cab. On some lines, cab signals are used by themselves, but more commonly they are used to supplement signals placed at lineside.
Automatic block signals are block signals which are joined by electrical circuits to provide a signal indication.
A system so arranged that failure to acknowledge a wayside signal indication, other than to proceed, will automatically result in the brake application until the train has been brought to a stop.
Automatic Train Stop System ...
The circuit on this page is a 6 Aspect driver for a bicolour LED type Searchlight Signal. The available signal indications are; SOLID - RED, YELLOW, GREEN, and FLASHING - RED, YELLOW and GREEN.
A designated track on which movements may be made by signal indication or at Restricted Speed under the authority of an employee designated in the Timetable.
Runt
Dwarf signal.
A railway signal which duplicates a signal indication at another location.
Retarder ...
A system of cab signals and other safety features for which specially equipped locomotives are required. If a train exceeds the permissible speed for a given signal indication, the brakes are automatically applied.
Automatic Train Stop (ATS) ...
Speed Control A device on an LRV, which will cause an application of the brakes if the operator fails to reduce the train's speed to the speed, required by the cab signal indication or on-board computer system or controlling electronics.
 See also: Switch, Track, Signal, Point, Engine
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