History of the diesel car featured an aluminium block, DOHC chain driven valvetrain, common rail direct injection and variable geometry turbocharger. In Spring 2005, Mercedes-Benz unveiled their first application of a mass-produced aluminum block diesel engine for passenger vehicles and commercial use. While aluminum is traditionally considered of inferior strength and temperature resistance to withstand diesel applications, Mercedes engineers made extensive use of CAD/CAM design to arrive at an aluminum block that would meet with Mercedes' testing and reliability standards. First use was in 2006 model-year vehicles in the E-Class sedan and ML-class and GL-class SUVs. Similar in weight () to the five-cylinder it replaced,
St. Louis Car Company to produce aircraft. During the two world wars, the company manufactured gliders, trainers, alligators, flying boats, and dirigible gondolas. Among their most successful products were the Birney Safety Car and the PCC streetcar, a design that was very popular at the time. The firm went on to build some of the vehicles used in the transit systems of New York City and Chicago, as well as the FM OP800 railcars manufactured exclusively for the Southern Railway in 1939. In 1960, St. Louis Car Company was acquired by General Steel Industries. In 1964, St. Louis Car completed an order of 430