The bi-sound signal to be mandatory for track work (IFA): the perceptibility of the signals have been tested under working noise conditions

Warning signal generators are used at points where track work is being carried out in order to warn workers of approaching trains on neighbour-ing lines, electroacoustic signal generators are generally employed. Harmonization of the warning signals would simplify instruction at the work site. In addition, the signal generators fitted on track-laying machines would not repeatedly have to be set to whichever warning signal is emitted by the signalling devices on the track being worked on.

In order to determine the perceptibility of the signals under working noise conditions, hearing tests were conducted on test subjects in the IFA's laboratory in conjunction with the responsible German Social Accident Insurance Institutions (those for the building trade and for the railway services), and with Deutsche Bahn AG. The comparison of signal pairs above the masked threshold revealed a clear preference for the Minimel signal at all signal levels. This result is also confirmed by the hearing tests performed with hearing protection worn. In a direct comparison, the Minimel signal can therefore be considered more suitable for track work than the Autoprowa signal. The products of both manufacturers are capable of producing this signal. DB Netz AG will issue a technical bulletin shortly announcing harmonization of the warning signals and a deadline for withdrawal of CO2 signal horns. This bulletin will make use of the bi-sound signal mandatory after 31 December 2013.

Source : Harmonized warning signal for track work. IFA 0334; Edition 12/2011; 617.0-IFA:638.21


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