Diesel causes Daisy to have to go to the works.

Diesel causes trouble between Daisy and Harvey.

When the Fat Controller is taken ill, his mother, Dowager Hatt, steps in to run the railway and discovers just how tricky it can be. Luckily, Emily is on hand to help her out.

Stephen thinks Millie ran away after he made fun of her, so he goes searching for her.

The Fat Controller installs a swanky new public-address system, but he doesn't know that it isn't working properly and he ends up sending quarry workers to beach, holidaymakers to the quarry and pigs to Callan Castle.

A new coach replaces Henrietta.

Thinking he is about to be replaced, Cranky works harder. But the harder he works, the more mistakes he makes. Now, he is sure that his days at Brendam Docks are numbered.

New crane Carly is eager to work, she causes Cranky to have no work.

Bertie the Bus breaks down so, Thomas has to take Bertie's regular passengers.

Philip sets out to figure why he has the number 68.

When Rosie is repainted red, James challenges her to a race.

While Edward's shed is being repaired, Edward tries to find somewhere else to sleep.

Emily finds herself stuck in the middle of Donald and Douglas' endless bickering.

Terence fails to take his own advice about being sensible and staying safe when he ventures across a frozen pond to collect a Christmas tree. It's not long before the ice is cracking and Terence is put in great danger.

Daisy is upset when Christmas doesn't follow its usual traditions. She learns that change isn't always a negative thing.

Gordon and Spencer's rivalry results in their coaches being mixed up and their passengers being upset. Can a new year mark a new start for the pompous pair?

The steam engines are put out of action during a big freeze due to a coal delivery being delayed. While they are waiting, the diesels are put to work keeping the railway running smoothly.