Railway line Kraslau (now Kraslava) - Daugavpils - a section of the Indra - Daugavpils line of the Latvian Railway.
Dispatch centralization for 28 switches on the Kraslau - Daugavpils section was built according to the Lengiprotrans project in the period 1971-1975.
Daugavpils is a junction railway station of the Latvian Railway. Through it, trains follow in the direction of the stations: Krustpils, Rezekne, Egleine, Indra.
In the period 1956-1970, Lengiprotrans developed a project for signaling and communication at the station.
The object was designed:
• relay interlocking with routing control of switches and signals;
• electrical centralization of switches and signals at the station;
• remote control of train fencing at stations.
As part of the construction of the external transport of the Riga Commercial Sea Port, Lengiprotrans developed a project for a bridge crossing over the Sarkandaugava channel at the section of Riga-Krasta station.
Longitudinal profiles were prepared, a connecting railway track from Riga-Krasta station to the bridge was designed.
In the 1970s, Lengiprotrans developed a project to improve the roadbed on 382 km of the Pytalovo — Rezekne section of the Baltic railway.
Were prepared transverse profiles, longitudinal geological sections.
Krustpils station is located within the city of Jēkabpils in Latvia. It is a junction, through the directions Riga - Daugavpils and Jelgava - Rezekne.
During the Second World War, the station at the station was destroyed. In the postwar years, Lentransproekt (since 1951 - Lengiprotrans) developed a project for its restoration. The volume of the passenger building was 5300 cubic meters.
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 early 2000s, Lengiprotrans prepared feasibility studies for the concept of the development of the main railway corridors of the Latvian Railway.
The German company DE Consult used the main provisions of the concept to prepare tender materials for the construction of individual objects along the highways Riga - Krustpils, Daugavpils - Krustpils - Jelgava - Ventspils, etc.
Plavinas HPP is a hydroelectric power plant on the Daugava River in Latvia, near the town of Aizkraukle. It is the largest hydroelectric power plant in the Baltics in terms of installed capacity.
In the 1950s, Lengiprotrans carried out design and survey work for the construction of a bridge over the dam of the Plavinskaya HPP hydroelectric power station. The following were prepared: a combined longitudinal profile, plans for Aizkraukle and Daudzeva stations.
Ventspils is a large railway junction in Latvia. Here, cargo is transferred from the commercial seaport to the railroad.
Railway line Riga - Ogre - section of the line Riga - Aizkraukle - Krustpils of the Latvian Railway.
In the late 1950s - early 1970s, the Riga - Aizkraukle section, the longest electrified line in Latvia, was electrified. As part of this, in 1959, according to the Lengiprotrans project, the Riga-Ogre section was electrified for a direct current of 3 kV.
The transfer of the railway to electric traction has made it convenient transport links between the resort areas of the Baltic coast and other regions of the country.
