Statistical review; during 1946, total of 11,384 signaling units were installed on railroads in United States and Canada, bringing increases over 1945 in construction of automatic block signaling, interlocking, classification yards and, particularly highway crossing protection.
Construction of signaling advanced 9.5 per cent
Ry Signaling
Railway Signaling ; 40 , n 1
1947
8 pages
Article (Journal)
English
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