Rail transport in the Soviet Union the Soviet Union collapsed. Twenty other stations were under construction in 1985. The country's rapid transit system was the most intensively used in the world. The Soviet Union was a pioneer in the development of the diesel locomotive to replace the steam locomotive (dieselization) on non-electrified lines. But the USSR failed to make steady progress and while they lead the United States at first, they soon fell behind and their last steam locomotives were retired about 15 years later than for the US. The first mainline diesel locomotive in the world began running in 1924 in the USSR but it
People's Commissariat for Posts and Telegraphs of the USSR of People's Commissars of the Union of Soviet Socialist Republics (CPC Union), elected by the Central Executive Committee of the Union for the term of the latter," and it would comprise the People's Commissar for Posts and Telegraphs. In the Council of People's Commissars of the Union republics, the People's Commissariat for Posts and Telegraphs had "an advisory capacity." Accordingly, after the formation of the Soviet Union, the People's Commissariat for Posts and Telegraphs of the USSR was created in 1923 instead of the similar agency of the RSFSR. Regulations on the new Commissariat were approved by the USSR Central