Dowager Hatt runs the railway, while Sir Topham Hatt is away.

A branch gets stuck in the open gears of his crane, but Harvey is too shy to ask for help. Instead, he tries to fix it himself and ends up derailing himself inside a tunnel.

Millie is given extra work around the estate and gets very cross when Stephen and Glynn forget to clear up the garden waste to help her. When Stephen also manages to hurt her feelings and can't find her the next day to apologise, he thinks that she must have run away!