This European standard specifies a type test method to measure noise levels inside the driving cabs of railway vehicles for assessing compliance with the relevant requirements of the Conventional Rail Noise Technical Specification for Interoperability (TSI) and the High-Speed Rolling Stock TSI. This method is applicable to: The measurement of noise resulting from the sounding of external warning horns when the vehicle is stationary; the measurement of noise while the vehicle is running. The method is not applicable to: The measurement of the noise from internal and external audible devices other than external warning horns; routine monitoring of the noise exposure of train crew. The test procedures specified in this European Standard are of engineering grade (grade 2) with a precision of ± 2 dB, which is the preferred method for noise declaration purposes, as defined in EN ISO 12001.