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 its 1955 Modernisation Plan, initially license-built versions of German designs (see Category:Diesel–hydraulic locomotives of Great Britain). In Spain, RENFE used high power to weight ratio twin-engine German designs to haul high speed trains from the 1960s to 1990s. (See RENFE Classes 340, 350, 352, 353, 354)