A domestic movie, about what year did you see it?

According to the information you provided, it is the movie Little Iron Man.

The film was released in 2002 and tells the life story of railway worker A Bin. Abin lives in a small house next to the railway. He salutes the passing trains every morning. The heroine is a little girl in the countryside. After falling in love with Abin, she broke up because she didn't understand Abin's work, but in the end she understood Abin's professionalism and chose to go back to Abin.

See if this movie matches your memory.