The entry signal (abbreviation: Esig ) is a railway signal . It is one of the main signals and marks the boundary between the station and the open route (“station boundary ”). If it is not available, the station boundary is on the trapezoidal board (Ne 1) or, if there is no trapezoidal board, at the tip of the entry switch. With the driving position of the entry signal, the dispatcher gives his approval for a train to enter the station.
As usual with main signals, it is at a precisely defined distance from the first danger point to which the arriving train is exposed if it does not stop before the entry signal. This distance is called the danger point distance and is designed for the speed permitted in front of the signal. In contrast to the slip path behind intermediate and exit signals, it is always kept free. As a rule, this is the first switch in the entry path, known as the entry switch . If it has to be driven over more often when maneuvering, the entry signal is shifted further towards the free route, which also shifts the relevant danger point accordingly. In this case, the danger point is marked with a shunting stop sign with the meaning "Stop for shunting trips" (signal Ra 10).
The station boundary or the danger point is relevant both for the incoming train and for maneuvering within the station. When maneuvering in the direction of the entry signal, the drive-in switch or the shunting stop board may only be driven over in exceptional cases with a written order from the dispatcher (which contains a precise time indication of when the maneuvering beyond the danger point must be completed). In this case, no train may be allowed into the block section before the entry signal during shunting .
As a rule, in Germany the entrances to train stations on main lines must always be secured with entry signals; however, they can be dispensed with on branch lines where the entry speed does not exceed 50 km / h .
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