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.
Dinah Sheridan
Bernard Cribbins
William Mervyn
Iain Cuthbertson
Jenny Agutter
Sally Thomsett
Gary Warren
Peter Bromilow
Ann Lancaster
Gordon Whiting
Beatrix Mackey
David Lodge
Deddie Davies
Christopher Witty
Brenda Cowling
Erik Chitty
Sally James
Dominic Allan
Paddy Ward