. Electric railway journal . FIG. 12—TOWER CONTROL AT THE BUSY WILLIAMSBURGBRIDGE PLAZA IN BROOKLYN, N. Y. as far as the parts in the street are concerned; theymust prevent any possibility of splitting the switch;they must not require more than ordinary intelligencefrom the motormen, and they should be non-operativeunder the combined current required for light, heat andair compressor circuits. Other desirable features arethese: Means should be provided to prevent splashingof mud and water upon passengers and pedestrians; itshould be impossible for a following car to throw theswitch between two
. Electric railway journal . FIG. 12—TOWER CONTROL AT THE BUSY WILLIAMSBURGBRIDGE PLAZA IN BROOKLYN, N. Y. as far as the parts in the street are concerned; theymust prevent any possibility of splitting the switch;they must not require more than ordinary intelligencefrom the motormen, and they should be non-operativeunder the combined current required for light, heat andair compressor circuits. Other desirable features arethese: Means should be provided to prevent splashingof mud and water upon passengers and pedestrians; itshould be impossible for a following car to throw theswitch between two trucks of a car which may be pass-ing over the switch; it should not be absolutely necessary October 19, 1918 Clear the Track for Berlin 691 CONTACTOR mtASPcomcroR. FIG. ■ WIRING DIAGRAM INTERLOCKING SWITCH OPERATION UNDER TWO-CAR TRAIN SERVICE for the motorman to see the position of the switch inorder to operate it correctly, and it should be impossiblefor a car to burn out the electrical apparatus by stand-ing with trolley pole directly under the contact two-car train operation, where both cars have theirtrolley poles in contact with the wire, it is absolutelyessential that the second car of the train cannot operatethe device. These somewhat numerous requirements may be sum-marized into five main factors which should be con-sidered in the selection of automatic switching are: (1) Perfection of service; (2) economicalmaintenance; (3) simplicity of design; (4) simplicityof installation, and (5) reasonable first cost. Where Most of the OperatingTroubles Come From A particularly troublesome factor in connection withelectric operation of switches arises from the switchpieces themselves. There are at least eight types ofswit
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