. Electric railway journal . ts. These are indicated bybanks of five lights. The lights of each group arearranged on different circuits so that some of them aresure to be burning, even though another circuit due tosome defect, should be open. The emergency exit doorsare counter-balanced so that they operate easily fromthe inside of the subway but they cannot be operatedby unauthorized persons from the outside. The pulling of an emergency-alarm pull box kills thethird rails on all tracks in that section, so that serviceis interrupted in both directions. Current is turnedon again only when the m
. Electric railway journal . ts. These are indicated bybanks of five lights. The lights of each group arearranged on different circuits so that some of them aresure to be burning, even though another circuit due tosome defect, should be open. The emergency exit doorsare counter-balanced so that they operate easily fromthe inside of the subway but they cannot be operatedby unauthorized persons from the outside. The pulling of an emergency-alarm pull box kills thethird rails on all tracks in that section, so that serviceis interrupted in both directions. Current is turnedon again only when the maintainer of the particularsection personally reports on the emergency telephonelocated at the alarm box which has been pulled, thateither all or some of the tracks are cleared and thatoperation can be resumed. Upon the receipt of sucha report, instructions are given to the substation opera-tors to put power on the particular tracks is accomplished by the substation operator manip- automatic change-overswitch. emergency telephone set September 20, 1919 Electric Railway Journal 581 ulating a small switch on the. emergency alarm panelwhich energizes the closing coil of each circuit breakerindividually. These circuit breakers are located in aspecial compartment in the subway. Each Section is Fed From Two Substations An accompanying diagram shows the method of sec-tionalizing the various third-rail divisions and the loca-tion of the substation and circuit breakers. From thisit will be seen that the third-rail distribution sectionsare arranged so as to be fed from two substations, andeach substation feeds two sections so that if one substa-tion should fail another source of power is sections vary in length from one to two third rails are also arranged with a gap of 50 each section break. This is done to prevent a singlecar from bridging a live section to a dead section, asmight happen if the two shoes on the opposite ends ofa car were t
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