The line Leningrad-Sortirovochny-Moskovsky - Ruchyi - Pargolovo - suburban sections of the Leningrad railway junction, is part of the Oktyabrskaya railway.
In the 1970s, according to the Lengiprotrans project, the Leningrad-Sortirovochny-Moskovsky - Pargolovo section was electrified. Since 1971, the design was carried out, in 1972 the issuance of working drawings for the electrification of a complex section located within Leningrad with a crossing over a metal railway bridge across the Neva River was completed. In 1973 the site was put into operation.
The Institute has developed an individual original project for the passage of the contact network along the drawbridge of the Finland railway bridge across the Neva River, which provided reliable two-way power supply of the contact network.
The facility widely used complete traction substations, equipment and apparatus mounted in metal cabinets at the plant. During installation, these cells were installed with a crane on previously prepared bases, which made it possible to reduce the construction time. These substations used outdoor air-cooled semiconductor silicon rectifiers, which are more reliable. Also, the wires of the longitudinal power transmission line-10 kV were used as a waveguide for train radio communication.
