British Rail track maintenance staff currently use a portable warning device to provide audible warning of approaching trains. The audible signal comprises a train warning signal, which is continuous and the same signal broken into a series of discrete 'bleeps' to signify that it is safe to work. If
β¦ LIBER β¦
Audible warning signals for police vehicles
β Scribed by I.L. McClelland
- Book ID
- 107722933
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 696 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0003-6870
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