. The street railway review . SEMAPHORE AND ELECTRIC MAGNETIC MOTOR. for them both to be energized in the normal direction at the sametime by extraneous currents. The various conditions which may occur with a train in the sec-tion may be catalogued thus: Both relays shunted, no extraneous current. (Normal.) One relay shunted, the other energized normally. (Signal circuitbroken at one point.) One relay shunted, the other energized reversely. (Signal circuitbroken at two points.) Both relays energized, one normally and one reversely. (Signalcircuit broken at one point.) The circuit through the s
. The street railway review . SEMAPHORE AND ELECTRIC MAGNETIC MOTOR. for them both to be energized in the normal direction at the sametime by extraneous currents. The various conditions which may occur with a train in the sec-tion may be catalogued thus: Both relays shunted, no extraneous current. (Normal.) One relay shunted, the other energized normally. (Signal circuitbroken at one point.) One relay shunted, the other energized reversely. (Signal circuitbroken at two points.) Both relays energized, one normally and one reversely. (Signalcircuit broken at one point.) The circuit through the signal magnet is designed to be alwaysopen at one point when a train is in the section, and often at two. The only parts of the mechanism which can be described as inany way delicate are the relays, and these are enclosed in weather-
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
