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acceleration alternating current alternating-current amount ampere applied armature arrangement axle battery brake rigging braking force capacity coils commutator conductor connection considerable constant construction contact line cost counter e.m.f. cylinder determined direct current direct-current motors distance distributing circuit effect efficiency Electric Railway electrolysis employed energy Engineering entirely equation equipment field flux friction gear give grade increased induction motor insulated interurban limited load loss machine magnetic mercury vapor rectifier method miles per hr motive power motor-generator necessary obtained operation ordinary passenger poles possible potential practically pressure proper rail railroad railway motors reduced repulsion motor resistors rheostatic roads rotating shown in Fig shunt motor signal single-phase speed-time curve steam locomotive stop substations switch third rail three-phase tion torque track track circuit tractive effort train resistance transformer transmission trolley truck varies volts weight wheels winding wire