Rotten warning signal

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A rotten warning signal is an acoustic (exception: Signal Ro 4) railway signal that applies to people working in or near the track area. There are instructions on how to behave when vehicles approach ( train travel ). Rotten warning signals are given with the multi-tone horn, but also apply if they are only heard in one pitch.


According to the railway signal regulations or the signal book (railway) of Deutsche Bahn AG, there are the following gang warning signals:

Ro1 Ro2 Ro3.svg
Signal Ro 1
Meaning: be careful! Vehicles are approaching on the neighboring track. Description: With the horn, a long note as a mixed sound of two different high notes.
Signal Ro 2
Meaning: clear work tracks. Description: With the horn two long notes one after the other in different pitches.
Signal Ro 3
Meaning: Clear work tracks as quickly as possible. Description: With the horn, at least five times, two short notes each in a row in different pitches.
Schematic representation of the signal Ro 4
Signal Ro 4 - flag sign
Meaning: Identification of the side of the track after which the working tracks must be cleared when the group warning signals Ro 2 and Ro 3 sound. Description: A white flag with a black border. The Ro 4 signal is located in the vicinity of the work rotten, parallel to the track.

See also


Deutsche Bahn AG: Signal book

Web links

Various documents, information and guidelines relevant to network access can be downloaded [1]