The Railway Children is a classic children's novel by Edith Nesbit, first published in 1906. It tells the story of three siblings, Roberta, Peter, and Phyllis, who are forced to move to a rural area of England after their father is mysteriously taken away.
From Wikipedia
The Railway Children is a children's book by Edith Nesbit. Originally serialised in The London Magazine in thirteen instalments from January 1905 to January 1906, it was published in book form in 1906. It has been adapted for the screen several times, of which the best known is the 1970 film version.