|Dinah Sheridan||Mrs. Waterbury|
|Bernard Cribbins||Albert Perks|
|Jenny Agutter||Bobbie Waterbury|
|William Mervyn||Old Gentleman|
|Iain Cuthbertson||Charles Waterbury|
|Gary Warren||Peter Waterbury|
|Sally Thomsett||Phyllis Waterbury|
After Charles Waterbury is imprisoned on false charges of selling state secrets, his wife must move to a small house near a railway station. The Waterbury children -- Bobbie, Phyllis and Peter -- occupy themselves watching the trains, even befriending a gentleman who frequents the station. When the children discover what has happened to their father, their new friend provides key assistance.