Train lines that are included in the PID system are labeled by letter S (or R) and a number, e.g. S1 or S88.

( ) = section with limited service only { } = section not part of the Esko-System Since 2011 December, almost all local tracks in Central Bohemian Region were involved in the Esko numbering (some lines were enhanced and 13 new line numbers assigned).

are fast trains which run along the same tracks as the S-lines but still stop at multiple stations integrated into the PID system.

The Nové spojení 2 is a planned underground tunnel with new stations in the inner city, which will free up capacity on existing lines for longer distance services.

[4] There are also plans to build completely new lines, such as a branch from the station Praha-Ruzyně to the Václav Havel Airport.