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,
Bilevel rail car by diesel locomotives and include electric generators housed in the control car. In Iran, the Tehran-Hashtgerd suburban commuter line is served with electric push-pull hauled trainsets with double-decker carriages manufactured by Wagon Pars in Iran. In South Korea, ITX-Cheongchun, the express train of Korail uses double-decker. Because of the two levels being separate on most cars, there is a physical limitation on a single conductor, as it can be difficult for him or her to verify, collect payment and sell tickets to passengers on the two levels. In 1955, the St. Louis Car Company came up with a solution in