Citation

Hoek-Snieders HEM, Houben R, Dreschler WA. Ergonomics 2020; ePub(ePub): ePub.

Copyright

(Copyright © 2020, Informa - Taylor and Francis Group)

DOI

10.1080/00140139.2020.1837397

PMID

33059526

Abstract

Locomotive engineers need to detect auditory warning signals for safe and effective job performance. We measured the levels and spectra of the warning signals and noises present in Dutch train cabins to evaluate the effectiveness of these signals. Audio-recordings were made in six train types during normal operation. Signal detectability was estimated using the Detectsound software and compared against ISO 7731. Signal detectability was also measured in six normally-hearing individuals in a laboratory setting. Signal levels ranged between 68 and 82 dBA. Noise levels ranged between 53 and 77 dBA. The acoustical requirements for signal detectability were not met in multiple driving conditions, especially at higher speed. Sufficient SNR's were achieved in the laboratory measurements, but difficulties can be expected in unfavorable driving situations or when the engineer suffers from hearing loss. Acoustical, environmental or work modifications might be required to prevent situations with insufficient audibility in hearing-impaired engineers.Practitioner summary: The audibility of the warning signals in Dutch trains was evaluated by comparing signal and noise spectra. The results showed that sufficient audibility is not always guaranteed. Under laboratory conditions, normally-hearing individuals could compensate for the suboptimal acoustic circumstances, but acoustical, environmental or work modifications might be required to prevent situations with insufficient audibility in hearing-impaired engineers.

Language: en

Keywords

alarms and warnings; ISO 7731; signal detection; train drivers; Vehicle ergonomics