The Railway Children

The Railway Children by Edith Nesbit
 
 When their father is mysteriously taken away, Roberta, Phyllis, and Peter must leave their comfortable London life for a small cottage in the countryside. The siblings soon find solace and adventure in the nearby railway line, where they perform heroic acts like stopping a runaway train and rescuing an injured boy. This timeless tale of resilience, hope, and family bonds follows the children as they befriend a kind stranger on the 9:15 train who may hold the key to proving their father's innocence.