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acceleration allows amperes amps applied armature average back E.M.F. bow collector brake cylinder brake rigging brushes calculated cam-shaft catenary cent circuit breaker coil commutator compressor conductor rail connected contactors copper drop Crown 8vo current limit relay D.Sc Dead Man's Switch dead weight Demy 8vo diagram direct current distance driving effective weight energy field flux friction full parallel full series gear ratio gradient increase induction insulation interlock line breakers line voltage load locomotive m.p.h. per sec magnet maximum method miles motor coaches notching curves ohms operating pantograph phase piston poles position pressure produce Railway regeneration repulsion motor reservoir reverse rheostat rotation running speed series motor shoe short-circuited shown in Fig shunt single-phase speed-time curve starting stator sub-stations switch temperature rise three-phase tons torque traction motors tractive effort trailer train resistance trolley wire volts watt-hours wheel winding