. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . he wheel if for any reason it leaves the wire; it also servesas an insulated support for the wheel at night and obviatesthe necessity of tying down the pole where such a rule is inforce. In a metal barn, it makes it impossible for the trolU-ypole to come in contact with the metal structure and thelive wire at the same time if the pole should fly off thewire. Sometimes at short curves under very low structuresit is the practice to do away witli the trolley wire altogetherand replace i
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . he wheel if for any reason it leaves the wire; it also servesas an insulated support for the wheel at night and obviatesthe necessity of tying down the pole where such a rule is inforce. In a metal barn, it makes it impossible for the trolU-ypole to come in contact with the metal structure and thelive wire at the same time if the pole should fly off thewire. Sometimes at short curves under very low structuresit is the practice to do away witli the trolley wire altogetherand replace it with an inverted brass or copj)er trough, inwhich the trolley wheel rolls along on its flanges. 39. When the car house is situated near the streetline, the several tracks running into it should not startfrom the main line, but asiding .v. Fig. IS, should belaid out so that throughcars need not go overso many switches. Thosefrom the left pass over theswitch a only, those fromthe right over b only, sa-ving some amount of wear and tear on car wheels and fig. is. greatly prolonging the life c^f the THE REPAIR SII01». 40. The repair shop is the place where all heavy repairsand alterations are made. A well-appointed repair shopshould include a///r^^?;//, iiiachi)ic sJiop, carpenter shop, mill,blaeksmitJi shop, paint shop, i^itiding room, eommntator room,controller room, and a icheel-grinding annex. In the pitroom, all truck and motor repairs are made. In the machineshop, all general machine work is done, such as fitting bear-ings, turning down commutators on the shaft, recutting 40 ELECTRIC RAILWAYS. § 23 bolts, etc. In the winding room, fields, armatures, armaturecoils, etc. are wound, insulated, and baked. In the com-mutator room, the parts of the commutator are assembledand the finished article tested. In the controller room, con-trollers, switches, resistances, etc. are repaired. In the mill,the repair parts for car bodies are made. The best place forthe machine sh
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