Locking signal

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A blocking signal is a railway signal .

Germany

Lock signal in the area of ​​the DV 301

A blocking signal indicates whether a subsequent track section may be used. It applies to train and shunting trips. Blocking signals are available as shape signals ( Hs ) and as light signals ( Ls ). Shape  blocking signals show the signal patterns Sh 0 and Sh 1, light blocking signals Hp 0 (formerly Sh 0) and Sh 1 (in the area of ​​the former German Federal Railroad) and Ra 12 (in the area of ​​the former German Reichsbahn). With some light blocking signals, a signaling of beacons is also possible to simplify the maneuvering operation. Since the Ra 12 signal is only valid for shunting movements, the light blocking signals in the area of ​​the former German Reichsbahn are equipped with a mast sign with two black dots if it is not only used as a destination signal for train movements. Otherwise, light blocking signals are given a white, red and white mast sign.

Blocking signals can, depending on the intended use and available space, be set up low at track level - then referred to as a dwarf signal (also called gravel dwarf ) - or high up. Especially when there is a lack of space, e.g. B. If the distance between the tracks between which a signal is to be set up is narrow, dwarf signals are set up. A train cover signal looks similar to a blocking signal .

If the blocking signal is used as a target signal for train journeys, it must be set up. This sometimes leads to signal booms for the blocking signal. In the early days of the electronic signal boxes in the area of ​​the former German Reichsbahn , train journeys were only allowed to end at main signals. If no train route continued from such a main signal, this main signal could only show Hp 0 and Ra 12. In the meantime, a high-level blocking signal can be used in such a case, as it shows the absolute stopping concept Hp 0.

Light blocking signal as a dwarf signal in Lampertheim

In the network of the former German Reichsbahn there are dwarf signals of the type WSSB as shunting signals. The upper part of the signal consists of a waiting signal Ra 11a that can be illuminated from the inside , the lower part contains two white secondary signal lanterns for the shunting signal Ra 12. The advantage over the light blocking signals is that a Ra 11a does not need any energy during the day and that it has no meaning for train journeys , so in this case does not have to be brought into the driving position. With the main signal, the upper part contains the red lantern (fully-fledged main signal lantern) for the stop, up to four secondary signal lanterns can be installed in the lower part, which, in addition to the maneuvering and replacement signals, can also show regular travel terms of the HL system . Dwarf main signals are not permitted on continuous main tracks and on those where passages at more than 40 km / h can take place.

Switzerland

In Switzerland it is a common signal term that is used for train journeys as well as for shunting journeys. This is regulated in the “Signals” chapter of the Swiss driving regulations and consists of a horizontal row of five white lights.

Blocking signal Switzerland

Both train journeys and shunting journeys have to stop before this signal.

If the blocking signal is not blanked may be, the dispatcher of the respective shunting or train must submit a compulsory receipt consent to overrun the blocking signal.

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