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.
Construction began on a 124 km section from Ledmozero to Kochkoma. However, the work was stopped due to lack of funding. The need for transport links in the region still remains. The new line could also provide a convenient connection to the Finnish rail network.