Petya’s dream is to become a tram driver, and the boy has explored every corner of the tram depot located near his house. The lad is well acquainted with the “residents” of the depot: the old trams, which long ago served out their term and are now laid up forever in its furthest, emptiest reaches. One day Petya decides to show his classmate Katya his secret place, and the excursion turns into an adventure.