The film tells about a voluntary communist clean-up, traditionally held in the city of Kuibyshev. Newsreels, the city of Samara, 1920s: workers of the locomotive depot, founded in 1875, ride an electric locomotive, waving their hands. Kuibyshev city, April 1977. Rally on the territory of the locomotive depot named after Krzhizhanovsky on the occasion of the opening of the traditional, voluntary communist subbotnik. The speaker behind the podium speaks of the depot collective as the initiator of the subbotnik, the creation of the first Marxist circle in the depot, the organizer of which was the driver's assistant Ivan Aleksandrovich Kuznetsov (sinhr., Off-screen). View of the building where the apartment of the revolutionary Gleb Maximilianovich Krzhizhanovsky was located and the monument on the territory of the locomotive depot. Depot workers at a clean-up day. The driver of the train, following the route "Kuibyshev-Moscow-Kuibyshev", Mikhail Yakovlevich Yakovlev, accepts congratulations on the end of the last voyage on account of the communist subbotnik. Kuibyshev city, May, 1977. May Day demonstration. Locomotive depot workers among other participants.