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The Bui - Vologda railway line is part of the Northern Railway. In the early 2000s, Lengiprotrans developed a project for second tracks on the site in order to increase the throughput of the East-West transport corridor. In addition, the line has a direct impact on the increase in cargo traffic at the Ust-Luga sea trade port.

Development of technical solutions for servicing the liquid cargo complex and passing the transit flow in the direction of Luzhskaya-General station and for the further development of the Luzhskaya-Vostochnaya station.

JSC Lengiprotrans since 2002 has been the general contractor for the design of the infrastructure development of the Ust-Luga railway hub.

On December 30, 1988, the Council of Ministers of the USSR approved the program "High-speed environmentally friendly transport". The development of the project of the high-speed highway St. Petersburg - Moscow (VSM-1) with the active participation of Lengiprotrans became the top priority.

In 1989, the institute began research and a feasibility study (TEO). In the course of this, 5 options for the direction of the route were considered: Western, Eastern, Combined, Dalny, Novgorod. Reconnaissance surveys were carried out at the reference sites.

In 1997-2003, Lengiprotrans developed a project for the completion and reinforcement of sections of the Nadym - Pangody - Novy Urengoy - Korotchaevo railway line in the Yamalo-Nenets Autonomous Okrug.

The railway passes through the difficult natural and climatic conditions of the tundra and forest-tundra. The geotechnical conditions of the region, due to the presence of permafrost soils, are difficult. The security of sand and peat deposit construction for the construction and strengthening of the subgrade is uneven, but on the whole sufficient.

Важной страницей в истории ПАО «Ленгипротранс» является проектирование Байкало-Амурской магистрали (БАМ) — самого масштабного объекта транспортного строительства XX века в России. Институт участвовал на всех этапах проектирования БАМа, начиная с участка Комсомольск-на-Амуре — Советская Гавань, построенного в годы Великой Отечественной войны.

The Baikal-Amur Mainline (BAM) is the largest railway passing through the territory of Eastern Siberia and the Far East in the direction of Taishet — Sovetskaya Gavan.

In 1960–1970, Lengiprotrans developed a project for the BAM Chara — Tynda section with a length of about 670 km. The route was laid in the region of the Olekma-Vitim mountainous country through rugged ridges dissected by river valleys. On the site, the institute designed 798 artificial structures, including a railway overpass along the Khani River.

The Baikal-Amur Mainline (BAM) is the largest railway running through the territory of Eastern Siberia and the Far East in the direction of Taishet - Sovetskaya Gavan.

In 1960-1970s "Lengiprotrans" developed a project of the BAM Chara - Tynda section with a length of about 670 km. The route was laid in the region of the Olekma-Vitim mountainous country through rugged ridges dissected by river valleys. On the site, the institute designed 798 artificial structures, including 25 large railway bridges and 1 overpass.

The bridge crossing over the Pinega River is designed on the Karpogory — Karpogory-Passenger section. It was built as part of the construction of the Mikun — Arkhangelsk railway line for the development of forests in the North-West of Russia.

The specialists of Lengiprotrans examined 2 places for the construction of the crossing and made up 3 options for each. As a result, a bridge was approved according to the scheme 34.2 + 89.1 + 2x111.1 + 89.1 + 34.2, with a total length of 481 m.

The bridge has two types of spans:

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