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The Volkhovstroy - Petrozavodsk - Belomorsk - Apatity - Murmansk railway was built before the First World War according to lightened technical standards. In the late 1920s, the Murmansk railway was used to develop the Khibiny ore deposit.

Small (Children's) October Railway (MOZhD) is designed to educate and train schoolchildren and students for railway professions.

The first MOZhD in Leningrad was opened in 1948. It was 8.1 km of track and included 3 stations (Kirovskaya, Zoo, Ozernaya). In this form, the road existed until 1964. Subsequently, the line was shortened, and by the 1990s it was only 2 km.

The Mikun - Syktyvkar railway line is a dead-end branch of the Northern Railway. In the late 1950s, the USSR government decided to build it. The project of the line was developed by the specialists of Lengiprotrans.

One of the significant objects of the route is the bridge crossing over the Vychegda river, combined for rail and road traffic.

The Alakurtti - Salla railway line is a section of the Ruchyi Karelskie - Alakurtti - Salla railway, reaching the state border with Finland.

In the early 1990s, Lengiprotrans carried out design work for the reconstruction of the Alakurtti - Salla railway section. The construction of the road was associated with the expediency of organizing the transportation of foreign trade goods through the ports of northern Finland along the railway line.

In the 1970s Lengiprotrans took part in the development of the external transport system of the Kostomuksha Mining and Processing Plant (GOK). One of the first projects was developed for the Ledmozero - Kostomuksha - State Border railway line. The road was intended to ensure the operation of the GOK and, in particular, the export of products (iron ore pellets) both in the direction of Russia and to the Finnish factories in the Oulu region.

In the 1980s, Lengiprotrans developed a project for the Obskaya — Bovanenkovo ​​line, the northernmost railway in the world. The route starts from the Obskaya station, which is part of the Transpolar highway, and goes to the North of the Yamal Peninsula.

In the post-war years Lentransproekt (since 1951 - Lengiprotrans) worked on the project of the Chum - Salekhard - Igarka Transpolar Mainline. The road was designed in special secrecy with the strategic goal of defending the Arctic coast of the USSR. In 1953, work was suspended with the death of I.V. Stalin, who supervised the construction.

In 1990-2000, Lengiprotrans developed a project for the Ledmozero - Vacha - Kochkoma railway line. The project was intended to provide a direct exit of trains from Kostomuksha to the Murmansk passage of the Oktyabrskaya railway. Earlier, in the 1970s, the institute had already worked in the area to provide approaches to the Kostomuksha mining and processing plant.

On the Ledmozero - Kochkoma railway line, Lengiprotrans engineers designed 18 small and medium bridges.

In 1982, Lengiprotrans began design and survey work on the Yagelnaya - Yamburg railway line in the Yamalo-Nenets Autonomous Okrug. Through the station Yagelnaya (Novy Urengoy) passes the Transpolar Mainline, designed by the Institute in the post-war years with the strategic goal of defending the Arctic coast of the USSR.

Railway line Galich - Soligalich - section of the Monzenskaya railway. This is the largest departmental railway in Russia, owned by Monzazheltrans LLC (it includes the Monzensky DOK, the Cherepovets Plywood and Furniture Factory and the Soligalichsky Lime Factory).

In the 1960s - 1970s Lengiprotrans developed a project for the Galich - Soligalich line with the aim of transporting minerals from peat mining enterprises to the Kostroma region.

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