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
Foreign concessions in the USSR the USSR Sovnarkom (Glavkoncesskom). Foreign concessions in the USSR Foreign concessions in the Soviet Union were enterprises (commercial, industrial, mining, etc.) with full and partial foreign capital. They existed since 1920 (in the RSFSR and later the Soviet Union). While some of the investment contracts were concluded long-term, vast majority of them were discontinued and even unilaterally terminated by the Soviet Union by mid-1930s according to the December 27, 1930, decree of Sovnarkom. The last concession contract was concluded in 1930. Foreign investments were replaced with work contracts concluded with western companies and professionals. The concessions were controlled by the