The Boxcar Children tells the story of four orphaned children, Henry, Jessie, Violet, and Benny Alden. They create a home for themselves in an abandoned boxcar in the forest. They eventually meet their grandfather, who is a wealthy and kind man (although the children had believed him to be cruel). The children decide to live with the grandfather, who moves the beloved boxcar to his backyard so the children can use it as a playhouse.
The Boxcar Children by Gertrude Chandler Warner