The Railway Children

Her child characters are remarkable because they are so entirely human. They are intelligent, vain, aggressive, humorous, witty, cruel, compassionate... in fact, they are like adults' Gore Vidal
The lives of Roberta, Peter and Phyllis are shattered when their father leaves with two strangers. When they and their mother move to a country cottage, they soon come to love the railway that runs nearby.
There follows a series of many adventures, including saving a train from disaster, and then finally helping the Old Gentleman try to solve the mystery of their father's disappearance.
One of the most famous stories of all time, enjoyed by millions of children and adults across the world.