An electrical automatic block signal system, with a special device or trip for operating the air brake valve of the locomotive, so that the train will be stopped if the danger signal is disregarded. Used on the Intramural R. R. of the Columbian Exposition. Details and description.
The Rowell-Potter automatic block signal system
RR Gaz
Railroad Gazette ; p 728-729
1893
2 pages
Article (Journal)
English
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