In this system head-block signals at ends of passing sidings or end of double track are directly controlled by dispatcher from his usual location; component parts of such system are control board with its automatic train graph, signals, power-operated switch machines and track circuits. (see also Railroad Herald, vol. 32, no. 3, Feb. 1928, pp. 30-31, 2 figs)
The dispatcher controlled signal system for train operation
Ry. Club Pittsburgh -- Official Proc
1928
14 pages
3 Figs.
Article (Journal)
English
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