Various types of circuit controlling fences and other devices developed and employed to warn of rock falls, slides, bridge failures and fires in tunnels and snow sheds; experience has shown that at points installed these devices have proved desirable, effective and justified from safety standpoint.
Protective devices increase safety of operation on southern pacific
Ry Eng Maintenance
Railway Engineering and Maintenance ; 36 , n 6
1940
Article (Journal)
English
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