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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.
The first reached by a train is known as the home signal. The last stop signal, known as the starting or section signal, is usually located past the points etc. and controls entry to the block section ahead. The distance between the home and starting signals is usually quite short (typically a few hundred yards), and allows a train to wait for ...
The new Ks signals have three lights green, yellow and red, and have only three aspects. Basically, the signal meanings of the Ks signals match the ones of the H/V signals and vice versa, although the aspects may look different. The PZB and LZB technologies are used the same way as for H/V signals.
Example Aspect Name Meaning Use Speed Restriction Red Stop Stop, do not proceed Non-mainline movements 0 Yellow Caution Proceed Continue to next signal on sight, at no faster than 25 km/h until past the next signal. Be prepared to stop at obstruction. Non-mainline movements 25 km/h
A Class 66 locomotive (right) is waiting at a red signal while a First Great Western (now Great Western Railway) passenger train (left) crosses its path at a junction. Railway signalling (BE), or railroad signaling (AE), is a system used to control the movement of railway traffic.
A British Upper Quadrant semaphore signal. In the days of the first British railways, "policemen" were employed by every railway company. Their jobs were many and varied, but one of their key roles was the giving of hand signals to inform engine drivers as to the state of the line ahead. [3]
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 ...