Thomas Goes Fishing is the twelfth episode ever made in Season 1.
Thomas wants to go fishing in a river, and is annoyed when the others say, "Engines don't go fishing." But he unknowingly gets the chance when the water column at the junction breaks down and his crew must use a bucket to pull water from the river to fill his tanks.
Thomas later develops a pain in his boiler because of a blocked feed pipe. Thomas is stopped in a siding as the driver summons an inspector and the Fat Controller. They look inside Thomas' tank and deduce that fish were collected in the bucket along with water. Thomas' crew fish them out with instruction from the Fat Controller and have a lunch of fish and chips. The Fat Controller asks if Thomas has learned his lesson and Thomas says that he has and that fishing is too uncomfortable.
- In one scene, Annie and Clarabel are facing the wrong way.