Rocco and his brother Martino are two rich country-estate owners who descend upon the city in search of adventure.

Driven by the constant quarrels with his wife and humiliated by a rich Milanese industrialist after asking him for a job, an unemployed person decides to steal a car from a garage guarded by a friend.

There were very few commercial feature films made during the Italian fascist era that were as openly propagandistic as this famous (notorious?) dramatic paean to the Blackshirts. The story takes place in a small village in Italy in October of 1922, on the eve of the fascist "March on Rome", in which King Victor Emanuel III was persuaded to consign power to Benito Mussolini. Gianfranco Giachetti is Dr. Cardini, a doctor at the local psychiatric hospital, where a strike has been called by the local socialists. Cardini turns to the fascists to help avert the strike. His son Roberto (Mino Doro) rounds up fascist friends to fight those aligned with the strikers and the town's socialists.

The film portrays the comic adventures of a group of summertime travellers. Produced at the height of the fascist era, Treno popolare was nonetheless free of propaganda, and featured the first film score by the legendary composer Nino Rota.