In the postwar years, Lengiprotrans developed a project for the Salekhard - Nadym - Igarka railway line, now known as the Transpolar Mainline. The road was conceived as a backup for the Northern Sea Route to connect the Soviet Arctic with the country's railway network. In 1953, construction was suspended. In the 1970s, the institute resumed work on certain sections of the highway.
In the 2000s, a new stage of design and survey work began within the framework of the Ural Industrial - Ural Polar complex program to create a mineral resource base for industry in the Northern and Polar Urals. The core of the transport component was to be the Polunochnoe - Obskaya - Salekhard and Salekhard - Nadym railway lines. Taking into account the experience of work in this region, Lengiprotrans was appointed as the main designer.
In March 2008, field work began on the main section of the Transpolar Mainline - the Salekhard - Nadym line. Lengiprotrans performed topographic-geodetic and engineering-hydrological works on a section about 180 km long from Salekhard and geotechnical works on a section of 90 km.
The design of the subgrade was based on the principle of maximum deceleration of processes. This implies that if it is impossible to calculate whether the embankment will freeze or thaw, then it must be designed so that this process is as slow and uniform as possible. For this, various geosynthetic materials were widely used in the structures - geotextiles, expanded polystyrene, geogrids.
The project consisted of three large stations - Salekhard, Tatarintsevo and Nadym, which provided for the construction of a large number of industrial and utility buildings. On Tatarintsevo, rotational housing for operators was also designed. Modern station complexes were designed at the Salekhard and Nadym stations. A number of artificial structures were designed at the facility. Thus, the entire design complex of the institute was involved in the work.
At the end of 2009, a positive conclusion was received on the Salekhard - Nadym railway line. At the moment, the project is being prepared for implementation as part of the creation of the Northern latitudinal railway.
