. Electric railway journal . SEATTLE MUNICIPAL RAILWAY—RIGHT-ANGLE CROSSINGOF DOUBLE TROLLEY AND SINGLE TROLLEY rent supply being subjected to a brief interruption asthe wheels pass over an insulated break, or to reversal,due to the oppositive location of positive and negativewires—which reversal, of course, has no effect on thedirection of motion of the motors, since armature andfield are affected alike. On cross-overs which are not used continually, theexpense and complication of trolley frogs, etc., are savedby stopping the cross-over trolley wires 18 in. awayfrom the main track wires, trol
. Electric railway journal . SEATTLE MUNICIPAL RAILWAY—RIGHT-ANGLE CROSSINGOF DOUBLE TROLLEY AND SINGLE TROLLEY rent supply being subjected to a brief interruption asthe wheels pass over an insulated break, or to reversal,due to the oppositive location of positive and negativewires—which reversal, of course, has no effect on thedirection of motion of the motors, since armature andfield are affected alike. On cross-overs which are not used continually, theexpense and complication of trolley frogs, etc., are savedby stopping the cross-over trolley wires 18 in. awayfrom the main track wires, trolley poles being shiftedby hand from one pair of wires to the other. Where the double-trolley railway crosses the single-trolley railway, insulated crossings were installed at theexpense of the double-trolley railway, an agreement be-ing drawn up between the two covering the matters offirst cost, cost of maintenance and liability for repairsand accidents. In each case the single-trolley wireswere allowed the under-run, pr
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
