The children save Jim from the tunnel and take him home to be looked after. A train arrives at the station bringing some good news.
The children are rewarded by the railway company, and they soon need their courage again when a boy goes missing in the tunnel.
Mother tells Bobbie she must keep her secret from the other children. Later, the children discover a fallen tree on the line as the express train is due.
Mother and the children come to the aid of a distressed Russian gentleman who arrives at the station and Bobbie learns the truth about her father.
Mother is taken ill and the children get a message of help to a kindly old gentleman on the train, who sends her a hamper.