In the 1950s, Lengiprotrans drew up a project to replace mechanical interlocking with relay interlocking with route control of switches and signals at Siauliai station.
In 1965-1966, a complex project of the station was developed, including the track section, power supply, water supply.
In 1982, design and survey work was carried out to reconstruct the Siauliai station in connection with the construction in the city of an enterprise for the supply of petroleum products for the State Committee for Petroleum Products of the Lithuanian SSR.
During the Soviet period, Lengiprotrans was actively involved in the design of transport infrastructure in the Baltics. This was largely due to the development of approaches to ports in the Baltic Sea. In the capital of Lithuania - Vilnius, the Institute has designed the largest number of overpasses.
In the 1970s, Lengiprotrans engineers developed projects for two road overpasses on the Drujos highway, which is the southern bypass of the central part of Vilnius. The structures are designed for the intersection of Subačiaus and Povilo Višinskio streets by the highway.
In 1960-1970, according to the Lengiprotrans project, the Balkhash - Sayak railway line was built in the Kazakh SSR. Transport links were required to supply Sayak ore to the Balkhash mining and metallurgical plant (now Balkhashtsvetmet). In the same period, the architectural and construction department of the institute developed a project for the station at the Balkhash station.
In the 1970s, Lengiprotrans developed a project for the electrification of the Tselinograd (now Astana) - Ekibastuz section of the Tselinnaya railway.
At the Ekibastuz-I station, the following were designed: a sewage pumping station and treatment facilities.
In the 1960s, Lengiprotrans developed a project for the development of the Riga-Passenger station of the Baltic railway.
At the station, the following were designed: a track section with platforms, tunnels, lighting, sewerage, utility and drinking water supply, drainage structures of the Riga-Passenger car fleet, an overpass over Dzirnau Street.
Also in 2005, a contact network was designed at the station.
In the 1960s Lengiprotrans developed a project for the development of the Radviliskis station of the Baltic railway.
The object was designed:
• track section and subgrade;
• water supply and sewerage in the section from the railway station to the car repair depot and the receiving depot;
• outdoor lighting of the foothill park;
• artificial constructions;
• construction part of the trolley garage;
• low passenger platforms;
• buildings for shoemakers, switchmen and heating inspectors;
Kartaly — Tobol is a railway section providing transport links between Russia and Kazakhstan.
Automatic blocking on the line was designed by Lengiprotrans in 1958 during the development of virgin fallow lands in Kazakhstan and adjacent territories.
In the 1950s–1970s, the projects of the former Lengiprotrans Plant Department were related to the post-war restoration of the industry, the development of production capacities of transport facilities, the transfer of railways from steam traction to diesel locomotive, the development of construction industry facilities and the design of specialized enterprises.
Molodechno - Vilnius - Kaliningrad - a section of the former Baltic railway, passing through the Byelorussian SSR, the Lithuanian SSR and the Kaliningrad region of the RSFSR.
In the 1960s, Lengiprotrans prepared a project for transferring the direction from locomotive traction to diesel traction.
Plans were developed for the territories of the following objects:
• Diesel depot of Vilnius station;
• steam locomotive depot of Vilnius and Kaunas stations;
• traction substation at Kaliningrad station;
In the 1980s, the Lengiprotrans Plants Department designed facilities on the new Obskaya — Bovanenkovo railway line. In particular, a locomotive depot was designed at the Obskaya station.
The Obskaya — Bovanenkovo line is the northernmost railway. The construction of the route was necessary to approach the gas fields on the Yamal Peninsula, the largest of which are Bovanenkovskoye and Kharasaveyskoye.
