The film takes place during one day of operation of a railway line, the capacity of which is lower than necessary. A disaster occurs: a passenger train crashes into a tank train, the driver's assistant is killed, and traffic on the section is delayed. The film explores the patterns that led to the accident.

Urzhumov
Zhelnin
Lyudmila
Sanka
Gvozdeva
Boychuk
Shilov
Double
Student
Urzhumov's assistant
Isayev
Kolobov