A virtual tour of the Riga site of full-scale samples of railway equipment of the historical heritage preservation department of the Moscow Center for Scientific and Technical Information and Libraries of the Moscow Railway. Steam locomotive O ("Main") is the first steam locomotive that became the main one in the locomotive fleet of Russian railways. Between 1890 and 1915, twelve locomotive factories manufactured more than 9,000 locomotives of this series, making the steam locomotive O the most widely produced of the pre-revolutionary locomotives. This locomotive worked on all state and most private railways of the Russian Empire, as well as on all railways of the Soviet Union. The most famous (and most widely produced) varieties are Ov and Od, nicknamed "sheep" and "joyka", respectively. Also, the O steam locomotives, being the main locomotives of armored trains, participated in the Civil and Great Patriotic Wars. The E steam locomotive (nicknames - Ekhovsky, Ekho, Eshka, Eshak) is a Russian and Soviet freight steam locomotive of the 0-5-0 type. The first steam locomotive of the 0-5O-0 type in Russia was developed in 1909 by order of the private Vladikavkaz Railway by the railway engineer Vaclav Lopushinsky. SO (Sergo Ordzhonikidze) is a Soviet mainline freight steam locomotive of the 1-5-0 type. SO - Sergo Ordzhonikidze's steam locomotive. It was produced from 1934 to 1951 at the Bryansk Machine-Building Plant (BMZ), Kolomensky Plant, Krasnoyarsk Locomotive Plant, Lugansk Diesel Locomotive Plant, Ulan-Ude Locomotive and Carriage Repair Plant, and Kharkov Transport Machine-Building Plant. 4,487 locomotives were built. The TE series steam locomotives (type 52 or BR 52) are German military steam locomotives that were received by the USSR in large quantities as trophies and reparations and were used on the USSR railways in the 1940s–1970s. FD ("Felix Dzerzhinsky"; factory designation - 1P - "1st type of steam locomotive"; nicknames - Fedya, Fedyuk, Felix) - Soviet mainline freight steam locomotive type 1-5-1, produced by the Lugansk (Voroshilovgrad) Steam Locomotive Plant from 1931 to 1941. It was created in connection with the industrialization carried out in the Soviet Union, when the country's government demanded that rail transport cope with the ever-increasing freight turnover. E (nicknames - Russian Dekapod, Efim, Elena) - a series of freight steam locomotives of the 1-5-0 type, delivered to the railways of the Russian Empire and the Soviet Union during the First and Second World Wars to quickly replenish the locomotive fleet. They were built at North American factories according to drawings developed by Russian engineers. Since 1917, the locomotives were supplied as military aid, and since 1943, under Lend-Lease. In addition, for various reasons, including political ones, these locomotives were used in the USA (Russian Decapod), Finland (Tr2 Truman) and the Republic of China (ST-1). The most famous variety is the EA, which accounted for about a third of all locomotives in the series. The E locomotives are also known for the fact that in 1920, three Bolshevik revolutionaries were burned in the firebox of one of them (El-629) by the White Guards: Lazo, Lutsky and Sibirtsev. Two experimental decapod locomotives, which entered service with Russian railways back in 1895 and were the first locomotives in Russia with five driving axles in one rigid frame, are often classified as part of the E series. They had only the manufacturer and axle arrangement in common with the other steam locomotives of the series. P36 (steam locomotive of the 36th type, often referred to in literature as type 2-4-2; nickname - General (for the characteristic colored stripes ("lamps") on the sides), sometimes erroneously - Pobeda) - Soviet mainline passenger steam locomotive, produced by the Kolomna Plant from 1950 to 1956. In terms of power, it was equivalent to the IS series locomotive, but had an axle load on the rails of no more than 18 tf, due to which it could be used on the vast majority of Soviet railways, replacing the Su series locomotives and significantly increasing the weight of passenger trains. The last locomotive of the series (P36-0251) was the last locomotive built for the Kolomna Plant and the last passenger locomotive produced in the USSR. Contrary to popular belief, the Pobeda locomotive is the L, not the P36. The L series locomotives were produced from 1945 and officially bore the designation P – Pobeda – until January 1947.