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.

A bankrupt aristocrat tries to keep up appearances while his situation worsens. To top it off the life savings given to him by a beggar to invest has been mistakenly claimed by the aristocrat's altruist society for their annual Feast of the Poor.

Sole is the first film by the great Alessandro Blasetti and bears a complex relationship to the reclamation of the Pontine Marshes, a seminal event in Fascist political history.