The Children's Train (2024, dir Cristina Comencini)

Original title (IT): Il treno dei bambini

In 1946, 7-year-old Amerigo leaves his impoverished family in Naples and gets on a train to go live with a wealthier family in the north as part of a postwar initiative to rescue children from poverty.

https://www.themoviedb.org/movie/1180634-il-treno-dei-bambini