Connecting lines

In the metro of Saint-Petersburg, as in any other, there are tunnels that are not intended for passenger traffic and provide the transfer of trains from one line to another - the so-called Service Connecting Branches.

There are six such places in Saint-Petersburg. Some of them are combined with service points and other tunnel facilities, and some consist of many different tunnels:

Accordingly, СадоваяRU is the only station in Saint-Petersburg with forks of railway tracks on both sides.