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When a carol concert is cancelled because of bad weather, Thomas borrowed a troublesome truck from the shunting yards. Thomas asks the Fat Controller to have it converted into a "Carols on Wheels" and he agrees. Later, Mrs. Kyndley is surprised when she hears the carols near her house.
"Carols on Wheels" is a standard truck with its sides removed and a roof added so that carollers can be seen and heard.
- In real life, riding in a truck without sides would not be permitted, as it is very dangerous.