The Baikal-Amur Mainline is known as one of the largest railway lines in the world. The construction of the main part of the railway, which took place in difficult geological and climatic conditions, took more than 12 years. By the decree of the Central Committee of the CPSU and the Council of Ministers of the USSR dated July 8, 1974 "On the construction of the Baikal-Amur railway", the necessary funds were allocated for the construction of the first category railway with a length of 3,100 km, the second Taishet—Lena track — 740 km, the Bamovskaya—Tynda and Tynda — Berkakit lines - 400 km. BAM was declared an All-Union Komsomol construction site, and masses of young people were sent here for internships.