TCh-15 Leningrad-Baltiyskiy is a large multi-unit depot in St. Petersburg, founded in 1933. The depot was intended for lifting and periodic repairs, as well as technical inspection of sections.
In 1945-1946 Lentransproekt (since 1951 - Lengiprotrans) developed a project for the reconstruction of the depot. The electrification of suburban traffic in the Leningrad railway junction on the directions of Oranienbaum, Zelenogorsk, Pavlovsk and Gatchina required the construction of depot facilities for the repair and operation of electric rolling stock.
In 1954, a project was drawn up for the expansion of the Leningrad-Baltiysky depot for the repair and inspection of six-car diesel trains running on the Leningrad-Moscow line.