Railway and Locomotive Engineering . vailable forservice, when the main knife switch isopen? .*\. The auxiliary apparatus consistingof lighting circuits, compressor, blower (when used), control circuits, when abattery is not used. Q. How is this possible and wliat isthe advantage gained? A. The wires to the auxiliary appara-tus are connected to the power supplyon the third rail shoe side of the mainswitch. With this arrangement the lights,compressor, etc., are available for usewithout any power being connected to theelectrical switches and motors. Thismakes it possible to work around thelocomo
Railway and Locomotive Engineering . vailable forservice, when the main knife switch isopen? .*\. The auxiliary apparatus consistingof lighting circuits, compressor, blower (when used), control circuits, when abattery is not used. Q. How is this possible and wliat isthe advantage gained? A. The wires to the auxiliary appara-tus are connected to the power supplyon the third rail shoe side of the mainswitch. With this arrangement the lights,compressor, etc., are available for usewithout any power being connected to theelectrical switches and motors. Thismakes it possible to work around thelocomotive and test out the operation ofthe control apparatus without any currentpassing to the motors and at night lightsare available for inspection. Q. Are these auxiliary circuits pro-tected in any way? A. Yes, by enclosed fuses usuallymounted in boxes. It is possible to use-enclosed fuses to protect the auxiliarycircuits as the current taken by each pieceof auxiliary apparatus is only a few-amperes. O. On locomotives wliat other. FIG. 6. KAISKU. piece of apparatus is used besides thethird rail shoes for collection of the cur-rent? A. An overhead trolley. Q. How is this connected and howdoes it operate? A. The overhead trolley is connectedto the leads connecting the third railshoes together and therefore is alivewhenever the third rail shoes are in con-tact with the third rail. The purpose ofthe overhead trolley is to provide ameans of keeping the current continu-ously on the locomotive when operatingin yards where the third rails arebroken (gaps) on account of the trackscrossing each other it being impossibleto have a continuous third rail. Keepingcurrent on the locomotive continuouslyis very important when the locomotive isstarting up a heavy train out of theterminal as interruption of the currentwould not only interfere with the gettingof the train out of the station at properspeed, but would cause serious surges to the train and to the electrical apparatusunle
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