We have to leave our house in London,' Mother said to the children. 'We're going to live in the country, in a little house near a railway line.' And so begins a new life for Roberta, Peter, and Phyllis. They become the railway children - they know all the trains, Perks the station porter is their best friend, and they have many adventures on the railway line. But why has their father had to go away? Where is he, and will he ever come back?
Peter、Roberta和Phyllis在母親的一聲令下搬到了鐵路旁的一間小屋裡,展開了新的生活,他們知道所有的鐵路路線,鐵道就是他們的遊戲場,站長就是他們最好的朋友。但是令他們不解的是,為什麼他們的父親要離開他們呢?他在哪裡?他還會回來嗎?