June 4 n 23 p 1553-1558: Discussion of two principal methods of directing train movements -- time interval and space interval. June 11 n 24 p 1669-1674: Comparative effectiveness of railway operation by train orders and by signal indication is discussed. Signal indication is preferred principally because necessary lapse of time between receipt and execution of train order is considered as element of weakness which does not exist in the case of operation by signals. (See also Ry. Signal Engr., vol. 13, no. 5, May 1920, pp. 208-210, 6 figs)
Train operation by signal indication
Ry. Age
Railway Age ; 68 , n 23-24
1920
10 Figs.
Article (Journal)
English
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