Abstract :
THE Diesel-electric locomotive has been made possible to a large extent by the electric system which so efficiently controls and transmits to the driving wheels and auxiliaries the concentrated horsepower of our modern Diesel engines. This electric system, consisting of generators, motors, switches, relays, meters, resistors, and thousands of feet of wire, depends primarily for its satisfactory operation on the various insulating materials which confine the electric currents to their proper circuits.
