The Kotlas - Kozhva - Vorkuta railway line is a part of the North Pechora railway (since 1959 as part of the Northern Railway). The construction of the highway played an important role in supplying the country with fuel from the newly formed Vorkuta coal complex, especially during the occupation of Donbass during the Great Patriotic War. In 1936, Lentransproekt (since 1951 - Lengiprotrans) was instructed to develop a project for the northern section of Kozhva - Vorkuta.
The Mikun - Ertom - Koslan 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.
Until 1965, on the Mikun-Koslan line, surveys and design of timber railways were carried out according to lightweight standards. Later, Lengiprotrans proposed to build a line as an integral part of the country's railway network along the general direction Mikun - Arkhangelsk. At the same time, it solved the problem of timber transportation. The proposal was approved, and three lines were included in the subsequent work plan: Mikun - Ertom with a branch to Koslan, Ertom - Karpogory and Karpogory - Arkhangelsk.
Tikhoretskaya is a Railway hub of the North-Caucasus Railway. In the 2010s, Lengiprotrans developed the reconstruction of the station within the framework of the project “Comprehensive reconstruction of railway section Kotelnikovo — Tikhoretskaya — Korenovsk — Timashevskaya — Krymskaya with a by-pass of the Krasnodar Hub of the North-Caucasus Railway”.
The project will allow for switching the excess train traffic from the Babayevo — Volkhovstory — Mga line towards the ports of the Gulf of Finland over to the Mga — Sonkovo — Dmitrov line and for ensuring the required throughput capacity of these lines, and it can become a “backup” for this line if necessary.
For JSC Russian Railways, the Mga — Sonkovo — Dmitrov main line is one of the essential projects which links the country centre with the North-Western Region.
The railway line St. Petersburg - Moscow runs through the territory of St. Petersburg and Moscow, Leningrad, Novgorod, Tver and Moscow regions. The population of the region served by the railway is more than 25 million people, which ensures a steady passenger traffic along the line.
In the 1990s, Lengiprotrans designed the St. Petersburg-Moskovsky Motor Wagon Depot at the Metallostroy station for maintenance and repair of electric trains.
In 2007–2009, the institute designed the reconstruction of the depot for servicing high-speed Sapsan trains intended for operation on the high-speed section of the St. Petersburg - Moscow - Nizhny Novgorod railway. The Sapsan trains that were being commissioned required a modern repair infrastructure, which could be provided through the reconstruction of the Metallostroy depot.
At the turn of the 20th – 21st centuries, Russia began to actively introduce high-speed traffic into the railway network. Lengiprotrans has developed a project for organizing high-speed passenger train traffic on the St. Petersburg - Buslovskaya section (State Border). This is the first highway connecting Russia with Europe by high-speed traffic.
For the first time PJSC Lengiprotrans began to consider the development of railway approaches to the port of Ust-Luga in 1992, when he took part in the development of the General Scheme for the development of seaports on the shore of the Gulf of Finland in the Baltic Sea.
The impetus to large-scale construction was the active development of the port for the planned increase in cargo turnover to 180 million tons, of which 118 million tons will have to be delivered by rail.
In 2011, the Ust-Luga Company established that by 2013–2014 the port's freight through the railway component is planned to be within 60 million tons.
