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In the 2000s, Lengiprotrans developed a project for the reconstruction of a city-wide highway of continuous traffic on the section from the intersection of Krasniy Znameni Avenue and Nekrasovskaya Street to the Stroitel stadium in the city of Vladivostok.

The reconstruction was required to increase the capacity of the highway section, eliminate the oversized existing structures and improve the environmental situation in the adjacent residential area.

Leningrad Institute of Railway Transport Engineers named after Academician V.N. Obraztsova (LIIZhT, now the Emperor Alexander I St. Petersburg State Transport University, PGUPS) is a higher technical educational institution in Russia, created at the beginning of the 19th century with the aim of training specialists for the construction of land and water transport routes.

The premises of the LIIZHT club with an auditorium for 1200 seats were designed by the specialists of Lengiprotrans in 1974-1980.

The Baikal-Amur Mainline (BAM) is the largest railway passing through the territory of Eastern Siberia and the Far East in the direction of Taishet - Sovetskaya Gavan.

In 1960-1970s "Lengiprotrans" developed a project of the BAM Chara - Tynda section with a length of about 670 km. The route was laid in the region of the Olekma-Vitim mountainous country through rugged ridges dissected by river valleys.

The Kuibyshev Railway (KZD) is one of the largest steel highways in Russia, passing through the Penza, Samara, Ulyanovsk, Tambov, Chelyabinsk, Ryazan, Orenburg regions and the Republics of Bashkortostan, Tatarstan and Mordovia.

In the 1990s, on the instructions of KZD, Lengiprotrans carried out an engineering-geological survey of a section at 981–982 km of the railway and developed anti-landslide measures.

The Tabashino - Yaransk railway line is a section of the Yaransk - Yoshkar-Ola railway, passing through the territories of the Kirov region and the Republic of Mari El. The line was designed by Lengiprotrans in the 1960s – 1970s.

The Yaransk Territory has historically developed as one of the largest agricultural centers of the Vyatka province, supplying food not only to it, but also to the neighboring districts of the Kostroma and Nizhny Novgorod province. However, the economic development of the region was complicated by the lack of a railway.

The Baikal-Amur Mainline, built in the 20th century, is still one of the largest transport construction projects in the world. "Lentransproekt" (since 1951 - "Lengiprotrans") from the moment of its formation took part in the design of the BAM. Design and survey work at BAM has a long history, consisting of several stages.

In 1937 "Lentransproekt" organized a complex expedition to carry out the final surveys of the Bureya (Ust-Niman) - Komsomolsk railway line. 6 complex parties worked on the track, including tunnel and hydrometric ones.

Железнодорожная линия Комсомольск-на-Амуре — Советская Гавань является восточным участком БАМа. Она была сооружена в годы Великой Отечественной войны с целью переброски войск и снаряжения на Дальний Восток России, необходимых для ведения войны с Японией.

During the Great Patriotic War, with the participation of Lentransproekt employees (since 1951 - Lengiprotrans), the Stalingrad - Saratov - Sviyazhsk railway line was designed and built to solve the most difficult problem of delivering material resources to the Stalingrad Front. 

The railway line Leningrad - Zelenogorsk - Roshchino - Vyborg is the main section of the Vyborg direction of the Oktyabrskaya railway.

In the 1950s – 1960s, Lengiprotrans participated in the design of the electrification of the suburban sections of the St. Petersburg railway junction. During these years, the Leningrad - Zelenogorsk - Roshchino line was electrified, and later the electric traction was brought to Vyborg.

The Vyborg - Kamennogorsk - Svetogorsk railway line is a section of the Oktyabrskaya railway in the Vyborg district of the Leningrad region. The line carries out cargo transportation in the direction of Finland.

The electrification of the Vyborg - Kamennogorsk section, 120 km long, was planned back in the 1980s, but was not implemented.

The electrification project for the Vyborg - Kamennogorsk - Svetogorsk section was developed by Lengiprotrans in the 1990s.