. Electric locking . ough the switch from H to J theparts of the switch on each side of the line is of an opposite polar-ity. This is the most ideal condition obtainable with a doubleslip switch, and a train on any part of the switch will shunt thetrack relay controlled by the circuit. It should be understoodthat, while the circuits just presented are shown as applied tomovable center frogs, they are also applicable to double slip 47 ELECTRIC LOCKING switches employing rigid center frogs. It should also be observedthat in insulating slip switches a series circuit arrangement whichwould also gi
. Electric locking . ough the switch from H to J theparts of the switch on each side of the line is of an opposite polar-ity. This is the most ideal condition obtainable with a doubleslip switch, and a train on any part of the switch will shunt thetrack relay controlled by the circuit. It should be understoodthat, while the circuits just presented are shown as applied tomovable center frogs, they are also applicable to double slip 47 ELECTRIC LOCKING switches employing rigid center frogs. It should also be observedthat in insulating slip switches a series circuit arrangement whichwould also give broken rail protection is not possible withoutcomplications which would be found prohibitive in railroad work. Gauntlet Tracks. Where two tracks converge so as tooccupy a space slightly greater than that required by a singletrack they are called gauntlet or intervolved tracks, and are usedon tunnels, bridges, etc., where the necessary space for a doubletrack is not available. Fig. 44 shows a gauntlet track circuit. IlG. 44. arrangement whereby only one battery and relay is required. Inthis circuit, if an electrical connection should accidentally be madebetween the two rails running close together, as at X, the railsbetween that point and the jumper wires at the end of the sec-tion will be cut out of the circuit, and consequently a brokenjumper wire or a broken rail at Y would not affect the opera-tion of the track relay. The polarity of the rails must be arrangedas shown, because if transposed a cross at X would create abattery short circuit. The best method of arranging a gauntletcircuit is to provide two separate track circuits and always havelike polar-ity on the two rails closest together. Conclusion. While in the present article d. c. track circuitsonly have been discussed, without reference to a. c. track cir-cuits, it can be said that the arrangement of the latter will besimilar in all cases, with the exception that proper provisionsmust be made for the return of the
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu31, booksubjectrailroads
