A film with a short storyline showing how locomotives and carriages are handled at stations from the arrival of a D-train until its next departure. The son of a train driver, who has to write an essay at school entitled "What I saw at the station," learns about the technical facilities of the marshalling yard along with the viewers: coal loading, water extraction, slag removal, work in the locomotive shed, cleaning the boilers, and maintaining the passenger cars. From the arrival of a train at the platform to its departure, the focus is on operational safety, cleanliness, and passenger comfort.