"propulsion systems" . "nose-suspended motors" . . "electric traction motor" . "motors" . . "electric motors" . "electric traction motors" . . "three-phase asynchronous alternating current traction motors" . "Traction motors" . . "electric motor" . . "conventional motors" . "Motor" . . "motor" . "electric motors for propulsion" . "Traction motor#Automatic acceleration" . "Traction Motor" . "traction motor" . "Traction motor" . . "traction motors" . "Traction motor" . . "traction control" . "traction drives" . . . . "series-wound motor" . . . . "power-train" . "traction equipment" . . . "onboard motors" . . "was transmitted to the wheels" . . . "DC series motors" . . "three-phase traction motors" . "six-motor design" . . . "traction" . "motorized" . . .