Watch Online Free on Watchseries. At the dawn of the 20th century, following their father's arrest on suspicion of betraying state secrets, the three Waterbury children—Bobbie, Phyllis and Peter—move with their mother to Yorkshire, where they find themselves involved in unexpected dramas along the railway by their new home. This stage-to-screen version, filmed at the National Railway Museum, features the steam train from the much-loved original feature film.