An explanation of the operations of the system near Danville, Ky., where a single track is signaled by the controlled manual system for opposing trains and by track circuit signals for following trains. (1000 w.) (No. 78265)
Combined manual and automatic block signaling on the C., N. O. and T. P.
R R Gaz
1906
Aufsatz (Zeitschrift)
Englisch
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