Diesel locomotive Diesel–hydraulic locomotives have a smaller market share than those with diesel electric transmission - the main worldwide user of main-line hydraulic transmissions was the Federal Republic of Germany, with designs including the 1950s DB class V 200, and the 1960 and 1970s DB Class V 160 family. British Rail introduced a number of diesel hydraulic designs during it 1955 Modernisation Plan, initially license built versions of German designs (see ). In Spain RENFE used high power to weight ratio twin engined German designs to haul high speed trains from the 1960s to 1990s. (see RENFE Classes 340, 350, 352, 353,
Steam diesel hybrid locomotive coal and oil and this was not favourable. When Kitson & Co. failed in 1934 the LNER handed the machine back to the company's receivers and it was dismantled. The Italian "Cristiani Compressed Steam System" used the process of mechanical vapour recompression. A diesel engine compressed steam which was then fed to conventional steam engine cylinders. The exhaust steam was re-compressed and used again. There must have been a small boiler to generate the initial charge of steam but this is not shown in the diagram. The steam was used mainly as a transmission system but the locomotive does count