. Electric railways, theoretically and practically treated . ich has never beenextensively used consists of a solenoid and a plunger act-ing in a very similar manner to the air brake cylinder. The type of brake most recently developed is the elec-tro-magnetic track brake illustrated in Fig. 157, where itis shown installed on a four-wheeled car. As will be seenfrom the illustration, this brake consists of an electro-magnet in which the track rails form part of the magneticcircuit. The horizontal thrust delivered by the position ofthis magnet hung from the running gear is transmitted bysuitable
. Electric railways, theoretically and practically treated . ich has never beenextensively used consists of a solenoid and a plunger act-ing in a very similar manner to the air brake cylinder. The type of brake most recently developed is the elec-tro-magnetic track brake illustrated in Fig. 157, where itis shown installed on a four-wheeled car. As will be seenfrom the illustration, this brake consists of an electro-magnet in which the track rails form part of the magneticcircuit. The horizontal thrust delivered by the position ofthis magnet hung from the running gear is transmitted bysuitable levers to the brake shoes acting on the carwheels. By means of this apparatus it is possible tosecure through the braking of wheel shoes the amount ofretardation available due to the adhesion between thewheels and the track, and in addition to this the retardationdue to the horizontal force required to drag the energizedelectro-magnetic shoe along the track. The currentrequired for energizing the electro-magnet is derived fromthe motors used as 252 ELECTRIC RAILWAYS. CHAPTER X. ELECTRIC LOCOMOTIVES. Electric locomotives have reached such a stage of devel-opment that they are now used quite extensively for com-mercial purposes. In detail an electric locomotive usuallyconsists of a supporting body containing two or moremotors suitably connected to the truck axles upon which themotor body rests. The locomotive body also contains acab, in which is the controlling mechanism. There are,however, many forms of locomotives which do not possessa cab, in which cases other arrangements are made for thecontrolling mechanism. When operated by storage bat-teries, the locomotive must be provided with suitable racksto contain them. To obtain maximum traction with an electric locomo-tive, the construction must be founded on laws which aresimilar to those governing the design of steam great difference between an electric locomotive and asteam locomotive lies in the ma
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