Details of practice on fourteen roads using "tonnage" signals, relaxing the stop-and-proceed rule. See also Ry. Signal Engr., vol. 14, no. 11, Nov. 1921, pp. 429-430.
Proposed modification of stop-and-proceed rule
Ry. Age
Railway Age ; 71 , n 19
1921
3 pages
4 Figs.
Article (Journal)
English
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