In its design special attention was paid to making apparatus weatherproof, that both "danger" and "clear" signals should be given positively, that no signal indication should depend upon a spring for its action, etc.
The Kerr automatic train control and fog signalling apparatus
Ry. Gaz
Railway Gazette and Railway News ; 37 , n 14
1922
5 pages
8 Figs.
Article (Journal)
English
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