. Electric locking . Lever lockcircuit FIG. 128. 3_im v_-. FIG. 129. the train has entered onto section B, the release wire is brokenthrough a full normal contact on lever 15. As the lever locks2 and 15 are controlled through the stick relay it is evident thatlever 2 cannot be placed full normal and consequently the stickrelay with signal 2 cleared cannot pick up in section A. Itshould also be apparent that in this scheme the locks must beapplied to the signal levers. By controlling the locks through afront point of the track relays the train must have passed outof the section before the route
. Electric locking . Lever lockcircuit FIG. 128. 3_im v_-. FIG. 129. the train has entered onto section B, the release wire is brokenthrough a full normal contact on lever 15. As the lever locks2 and 15 are controlled through the stick relay it is evident thatlever 2 cannot be placed full normal and consequently the stickrelay with signal 2 cleared cannot pick up in section A. Itshould also be apparent that in this scheme the locks must beapplied to the signal levers. By controlling the locks through afront point of the track relays the train must have passed outof the section before the route is released. In Fig. 129 twostick relays are employed to insure that the train passes over 134 STICK LOCKING the crossing before the release of the stick locking is relay D will pick up when a train is on the crossing bythe pick-up circuit breaking through both relay back points inseries and the relay will stay picked up as long as a train isoccupying either track section A or B. Stick locking relay Swill pick up through a front point
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu31, booksubjectrailroads
