In 1984-1987, Lengiprotrans developed a project for the Korotchaevo - Russkoye railway line. This section is part of the Chum - Salekhard - Igarka Transpolar Highway, the project of which was created by the institute (at that time "Lentransproekt") in the postwar years. The road was developed in special secrecy with the strategic goal of defending the Arctic coast of the USSR. In 1953, the work was suspended due to the death of I.V. Stalin, who supervised the construction.
The Synya - Usinsk railway line is a dead-end branch of the Northern Railway. This line plays a significant role in the development of the Komi Republic: its construction was necessary to connect the city of Usinsk, the center of oil and gas production, to the country's railway communication. In the future, it was planned to continue the route to the city of Naryan-Mar for further development of natural deposits.
The railway line is single track. The main attraction of the route is a large 1305 m long bridge across the Usu River.
The Ertom - Karpogory section is part of the Mikun - Arkhangelsk railway line. The road was necessary for the development of huge forests and the development of the timber processing and pulp and paper industries in the Arkhangelsk region and the Komi Republic.
In 1947 - 1953 "Lentransproekt" (from 1951. - "Lengiprotrans") developed the project of the Chum - Salekhard - Igarka railway line, now known as the Transpolar Mainline. The route was supposed to become a link in the Great Northern Railway, which runs along the Arctic Circle from the Barents Sea to the Sea of Okhotsk and Chukotka. The idea of creating a highway arose at the beginning of the 20th century.
For many years Lengiprotrans has been developing the railway network in the Syrian Arab Republic. The main task was to connect the seaports of Latakia and Tartus with the eastern regions of the country for the export of goods (oil, cotton, wheat). Before the start of these works, Syria had only one railway.
First of all, the institute began to develop the project of the Kamyshly - Aleppo - Latakia railway line. The works were divided into two sections: Oronte - Latakia and Oronte - Aleppo - Kamishli.
Railway line Bui - Svecha - a section of the Northern Railway. In the 1960s - 1970s Lengiprotrans developed a project for second tracks on this section.
In 1967-1969, geological surveys were carried out and a design assignment was drawn up. In 1971, the project was approved, and construction began, which was carried out in two stages.
In the 1960s – 1970s, Lengiprotrans prepared projects for highways in the Leningrad Region by order of the USSR Ministry of Agriculture.
A major overhaul of the existing roads was planned with reconstruction in certain sections:
• Pulkovo - Vanakyula (15 km);
• Zalesye - Porechye (30 km);
• Vispory - Novoselye (10 km);
• Ovtsino - Plant im. Sverdlov (15 km).
The Vologda — Cherepovets railway line — a section of the Northern Railway, was put into operation as part of the Obukhovo — Vologda line in 1905.
The project of the second tracks on the Vologda — Cherepovets section was developed by Lengiprotrans in 1945–1954. This was due to the post-war task of restoring the country's heavy industry and strengthening the railways for the transportation of manufactured products.
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.
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.
