Satisfactory for thin traffic; home and distant signals arranged on "normal danger" plan. (See also Ry. Age, vol. 76, no. 15, Mar. 15, 1924, pp. 735-738, 3 figs.)
Automatic signals for a railroad grade crossing
Ry. Signalings.
Railway Signaling ; 17 , n 4
1924
4 pages
3 Figs.
Aufsatz (Zeitschrift)
Englisch
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