A late model, LeTourneau-Westinghouse, Model "D" Tournapull scraper. This machine is fitted with a 4 cylinder GM 2 stroke engine, a 5 speed "crash" gearbox, and has a big electric generator behind the engine, which produces electricity for the electric motors that power the steering, the lift motors on the bowl and apron, and the tailgate motor. These things are a handful to drive, and I know all about them, because I've actually got a licence to drive one! These machines need the main engine run at full RPM, or near it, to keep up the voltage to the electric motors. Otherwise, you run out of steering or power to load or empty the bowl. Early models were often known as "widowmakers" due to their tendency to kill operators who weren't properly trained on them. If you commenced a sharp turn and backed off the throttle - you couldn't straighten up, and they would sometimes roll over as a result. The early "D's" had multi-plate air disc brakes that would lock up all wheels at 40 mph, fully loaded. These brakes were incredible. However, when Westinghouse bought the LeTourneau Co in 1953, they commenced to put Westinghouse Air-operated drum brakes on the Model "D's", saying that the material used in the original LeTourneau disc brakes was too deadly to continue using.