In addition to hull design which let her attain speed at far less power than other big liners, "Normandie" had a turbo-electric transmission, with turbo-generators and electric propulsion motors built by Alsthom of Belfort. The CGT chose turbo-electric transmission for the ability to use full power in reverse, and because, according to CGT officials, it was quieter and more easily controlled and maintained. The engine installation was heavier than conventional turbines and slightly less efficient at high speed but allowed all propellers to operate even if one engine was not running. This system also made it possible to eliminate astern turbines. An early form of radar was installed to prevent collisions. The rudder frame, including the 125-ton cast steel connecting rod, was produced by Škoda Works in Czechoslovakia.