Signal departments of various railroads in United States have grown up in last 20 years from departments to which were assigned primarily duty of surrounding train movements with protection, to departments which must devise, install and maintain devices for expediting train movements to promote efficiency and economy in train operation; switch operation; insulated joints. Before Roadmasters' and Maintenance of Way Assn. (Ry. Eng. and Maintenance, vol. 26, no. 10, Oct. 1930, pp. 431-433, including discussion)
Track maintenance as affected by signal operation
Ry. Signaling
Railway Signaling ; 23 , n 10
1930
3 pages
1 Fig.
Article (Journal)
English
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