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In 2013, Lengiprotrans developed a project for the modernization of charging devices and testing brakes in the passenger and receiving and departure depot of the Shkirotava station of the Latvian branch of the Baltic Railway. The implementation of the project ensured the timely charging of the accumulator batteries of the passenger cars and their normal operation. The project provided for the safety of train traffic and the timely elimination of malfunctions of the brake system of freight and passenger cars.

In the 1950s and later, Lengiprotrans engineers worked in the Baltics. The railway overpass at the intersection of Brassa Street in Riga was designed by order of the USSR Ministry of Railways. In places where a busy intercity motorway intersected with railroad tracks, level crossings were eliminated. Thus, traffic safety was ensured.

In the 1970s, while working in the Baltics, Lengiprotrans engineers developed projects for various transport facilities. Thus, according to the project of the institute, the reconstruction of the railway bridge across the Varduva River on the Riga — Liepaja section was carried out. The implementation of this project ensured the safe crossing of the water hazard on the railway section. 

Engineers of Lengiprotrans have developed projects for various transport facilities in the Baltics. One of such objects, a pedestrian bridge over the railway tracks of the chemical cargo base park, was designed to ensure the safety of people when crossing the railway tracks of Ventspils station. 

The Riga - Jelgava railway line is the shortest electrified branch of the Latvian Railway.

In the period 1976-1980, Lengiprotrans developed a project for transferring the electrified section Riga - Jelgava to telecontrol. The same work was carried out on the Riga - Tukums section.

Telecontrol devices included:
• telemechanics dispatch center;
• executive points;
• relay devices;
• communication devices.

The Daugavpils railway junction is a large junction of the Latvian railway that emerged in the second half of the 19th century.

For many years "Lengiprotrans" has participated in the design of the objects of the Daugavpils junction. In 2012, the specialists of the institute prepared pre-design studies for the development of the railway junction.

The railway line Pskov — Daugavpils — Vilnius is a section passing through the territory of Russia, Latvia and Lithuania.

The project of the second tracks on the site was developed by Lentransproekt (since 1951 — Lengiprotrans) in the late 1930s – early 1940s.

The railway line Bigosovo - Kraslava is a section connecting the Belarusian and Latvian railways.

In the 1970s, Lengiprotrans designed a dispatch centralization at the Bigosovo - Kraslava section for 34 switches.

Trust "Baltmorgidrostroy" was established in 1952 with the aim of restoring damaged sea and commercial ports, ship repair companies in the Baltic region.

In the cities of the Baltic coast (Kaliningrad, Klaipeda, Liepaja, Ventspils, Riga and Tallinn), the trust had its own production bases to provide construction and industrial products for projects under construction. In the port city of Liepaja, the production base SU-426 of Baltmorgidrostroy was located, the expansion project of which was developed by Lengiprotrans in 1992.

The Freeport of Riga is a large port on the eastern coast of the Baltic Sea in Latvia. It stretches for 15 km along both banks of the Daugava River within the city of Riga. Navigation is carried out all year round. The main objects of cargo turnover are coal, oil products, timber, fertilizers and container cargo.

In order to increase the cargo turnover of the seaport, Lengiprotrans has developed a project for modeling the operation of the railway tracks of the Rinuzhi terminals of the Freeport of Riga in conjunction with the work of Ziemelblazma station in 2013.