New type of fence, developed by Pennsylvania, to warn trains of rock, ice or soil movements which might endanger train operation; fence is linked electrically with roadway signals to detect and warn of rock falls and earth slides. (see also Ry Signaling v 29 n 1 pt 1 Jan 1936 p 28-31)
Taking danger out of slides
Ry Eng Maintenance
Railway Engineering and Maintenance ; 32 , n 1, Part 1
1936
5 pages
Article (Journal)
English
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Engineering Index Backfile | 1936
Tema Archive | 1998
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