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Railway signal in Ploiești West railway station, Romania. This type of signal is based on the German Ks signals. The signal head is the portion of a colour light signal which displays the aspects. To display a larger number of indications, a single signal might have multiple signal heads.
Signals are most commonly mounted on trackside masts about 12 to 15 feet (3.7 to 4.6 m) high to put them in the eyeline of the engineer. Signals can also be mounted on signal bridges or cantilever masts spanning multiple tracks. Signal bridges and masts typically provide at least 20 feet (6.1 m) of clearance over the top of the rail.
Such signals as electrically operated automatic and interlocking signals were widely adopted in the U.S. After 1908 with the advent of the Union Switch & Signal's Styles "B" & "S" and the General Railway Signal Company's universal Model 2A mechanisms manual semaphores and earlier electric disc signals quickly began to disappear.
Depending on the manner in which they are used, and the nomenclature favoured by the railway administration concerned, stop signals may be further categorised as 'home signals' or 'starting signals', for example. Some stop signals are in the form of a fixed signal, generally a white board with a red solid circle.
When a crossing loop is reached, a Home Signal will have a signal for each, with the crossing segment signal being 45 degrees beneath the main line signal and in the direction of the turnout. For example, if the turnout was a right-hand the crossing signal would be on the right side below the main signal.
This type of aspect requires the driver to slow, for example, because the next signal shows a non-clear aspect (double yellow) or imposes a speed limit (yellow-green horizontal). When the train passes a signal as the driver must confirm that he saw the signal by pushing a button, otherwise the system will apply the emergency brake.
Example of an L type light signal. Swiss light signals are divided into two classes, recognizable by the difference in shape of the signal: type L (for Light) and type N (for numérique (digital)). Type L was developed many years ago. The N system was developed for the Rail 2000 project and shows a clear influence of the Dutch NS'54 system. In ...
Signal Meaning in Great Britain [1] Meaning in India [2] 1: Stop: Stop train 1—1: Zone of speed restriction over, resume prescribed speed 1—2: Close doors: 2: Ready to start: Start train 2—2: Do not open doors: Passing automatic signal at 'on' 3: Set Back: Guard required by driver 3—1: Lock central door locking: 3—2—1: Testing doors ...