The Narva - Tapa - Tallinn railway line runs through the Republic of Estonia. The line is part of the Baltic Railway, built in 1870. In the 1980s, Lengiprotrans PJSC developed a project for the construction of second tracks on the Narva - Tallinn section.
Strengthening the line was due to the fact that it was an important link in the USSR railway network and connected the Tallinn industrial region and the seaport of Muuga with other republics.
Nesterov is a border station of the Kaliningrad railway located in the Kaliningrad region on the border with Lithuania.
The Vyborg railway junction is a large junction of the October railway in the Leningrad region.
Immediately after the end of the Great Patriotic War, Lengiprotrans developed a project for the restoration and reconstruction of the Vyborg junction.
In the 1990s, the institute continued work on the reconstruction of the unit: water supply and sewerage facilities were developed. However, due to the crisis in the economy and the decline in production in the country, the project was not implemented.
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 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.
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.
