Report of Committee 6 concerning following specifications of railroad signaling work: gray-iron castings, malleable-iron castings, wrought-iron bars; drawings to be made obsolete; new drawings; cooperative reports. (See also - no. 3 Feb. 1930, pp. 749-781)
Designs
Am. Ry. Assn. -- Signal Section Proc
1930
8 pages
Article (Journal)
English
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