Specifications covering: car-retarder system, electric motor switch operating mechanism, centralized traffic control system, centralized traffic control machine, electric lock, time release, interlocking lever circuit controller; signaling over spring switches. (See also Am. Ry. Assn. -- Signal Section Proc vol. 28, no. 2, Oct. 1930 pp. 316-329)
Interlocking
Am. Ry. Assn. -- Proc
1930
86 pages
Article (Journal)
English
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Engineering Index Backfile | 1930
Engineering Index Backfile | 1931