. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ible 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 useenclosed fuses to protect the auxiharycircuits as the current taken by each pieceof apparatus is only a fewamperes. Q. On D r. locomotives what other the train and to the electrical ap
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ible 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 useenclosed fuses to protect the auxiharycircuits as the current taken by each pieceof apparatus is only a fewamperes. Q. On D r. locomotives what other the train and to the electrical apparatusunless the engineer should shut off ateach gap. It may not be necessary at alltimes to use the overhead trolley, asthere will be sufficient momentum tocarry the locomotive over the gap. Theoverhead trolley is normally in its lowestposition and is only raised to make con-tact with the overhead third rail whennecessary. The operation of the trolleyis under the control of the engineer andis raised by air pressure, the weight beingsufficient to bring it down when air isreleased from the FIG. 6. 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 c
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