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Volume 134, Issue 2, August 2013
- NOISE: ITS EFFECTS AND CONTROL 
134(2013); http://dx.doi.org/10.1121/1.4812771View Description Hide Description
This study investigated the annoyance associated with the rolling noise of different railway stock. Passbys of nine train types (passenger and freight trains) equipped with different braking systems were recorded. Acoustic features showed a clear distinction of the braking system with the A-weighted energy equivalent sound level (L Aeq) showing a difference in the range of 10 dB between cast-iron braked trains and trains with disk or K-block brakes. Further, annoyance was evaluated in a psychoacoustic experiment where listeners rated the relative annoyance of the rolling noise for the different train types. Stimuli with and without the original L Aeq differences were tested. For the original L Aeq differences, the braking system significantly affected the annoyance with cast-iron brakes being most annoying, most likely as a consequence of the increased wheel roughness causing an increased L Aeq. Contribution of the acoustic features to the annoyance was investigated revealing that the L Aeq explained up to 94% of the variance. For the stimuli without differences in the L Aeq, cast-iron braked train types were significantly less annoying and the spectral features explained up to 60% of the variance in the annoyance. The effect of these spectral features on the annoyance of the rolling noise is discussed.