Diesel locomotive set, and went into series production with other streamlined car sets in Germany starting in 1935. In the USA, diesel-electric propulsion was brought to high speed mainline passenger service in late 1934, largely through the research and development efforts of General Motors from 1930–34 and advances in lightweight carbody design by the Budd Company. The economic recovery from the Second World War saw the widespread adoption of diesel locomotives in many countries. They offered greater flexibility and performance than steam locomotives, as well as substantially lower operating and maintenance costs. Diesel–hydraulic transmissions were intrdouced in the 1950s, but from the
TU2 diesel locomotive trains. Later they were replaced by more modern designs. As of 2007, they are no longer in use on the narrow gauge railways in Russia, but some narrow gauge railways in Ukraine still use them. Many children's railways use TU2 locomotives too. The Aukštaitijos narrow gauge railway in Lithuania also still operates the TU2. TU2 is a diesel-electric locomotive. The main diesel engine is 1D12 and it produces 300 hp. The main engine drives the electric generator (195 kW) that supplies electricity to four traction motors, 62 kW each. TU2 diesel locomotive TU2 (ТУ2) is a Soviet narrow gauge diesel