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The invention of the electric light, which could be made brighter than oil lamps and hence visible both by night and day, resulted in the development of position light signals and colour-light signals at the beginning of the 20th century, [11] which gradually displaced semaphores. [12] A few remain in modern operations in the United Kingdom. [13]
There are two main types of signaling aspect systems found in North America, speed signaling and weak route signaling. [citation needed] Speed signaling transmits information regarding how fast the train is permitted to be going in the upcoming segment of track; weak route signaling transmits information related to the route a train will be taking through a junction, and it is incumbent upon ...
Later signals using electric lamps used green lenses. Some signals converted to electric lamps from oil, used a yellow-tinted bulb with the original blue lens to maintain the correct colour or from 1996 on the Western Region of British Railways, a 12-volt 5-watt bulb was fitted but fed at 10.7 volts to produce a brilliance approximating to the ...
Timetable and train order was not used widely outside North America and has been phased out in favor of radio dispatching on many light-traffic lines and electronic signals on higher-traffic lines. The only railroads currently still using authentic train order operations is the South Shore line in Indiana and the LIRR in New York.
The mast was made of two steel profiles (Zores sections); metal steps being fitted to the mast so that they were parallel to the track. Until 1922, the colours of the night signals were unusual, like those of the distant signal: Clear (Freie Fahrt): white light; Proceed Slowly (Langsamfahrt): white light above a green light; Stop (Halt): red light
In the very early days of railway signalling, the first coloured lights (associated with the turned signals above) presented a white light for 'clear' and a red light for 'danger'. Green was originally used to indicate 'caution' but fell out of use when the time interval system was discontinued.
Clearing sequence from red to green of a 4 aspect colour light signal. In total, colour-light signals in the UK display seven aspects. These are: Green – Clear. The train may proceed subject to any speed restrictions applying to the section of line or to the train itself. (See also Flashing Green below.) Double yellow – Preliminary caution ...
Since 2000, new signals have mostly been of the Ks system. There are exceptions; for example, H/V signals were installed on the light rail extension in Kassel post-2000 because the authorities wanted to avoid the risk of driver confusion on busy lines. The new Ks signals have three lights green, yellow and red, and have only three aspects.