ZÖLLNER Knowledge // What is a TSI-Signalhorn?
Our experts explain
A ZÖLLNER Makrofon is a compressed air-operated diaphragm sound transmitter for emitting acoustic signals that is used on rail vehicles and complies with the Technical Specifications for Interoperability (TSI). These specifications were adopted by the European Union to ensure compatibility and safety in European rail transport.
A ZÖLLNER Makrofon must therefore meet certain requirements in terms of volume, frequency and duration of the signal to ensure that it functions effectively as a warning signal.
The sound of the signal horns must be designed in such a way that it is recognisable as coming from a train. The signal sound must be different from the sound of other warning devices, used in road traffic or in factories, and from other common warning signals. When the horns are triggered, at least one of the following separate warning signals must be emitted:
Signal 1: The basic frequency of the separately emitted sound must be 660 Hz ± 30 Hz
(high tone).
Signal 2: The basic frequency of the separately emitted sound must be 370 Hz ± 20 Hz
(low tone).
The document EN 15153-2 specifies the requirements for signal horns to achieve the required audibility of approaching railways. The requirements of this document do not apply to urban railways.
NOTE The requirements for external audible warning devices for urban railways are specified in EN 15153-4.
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