From the Railway Series Book 4, "Thomas Goes Fishing" by the Rev. W. Awdry.
Thomas often sees people fishing in the river and wants to go fishing too. He gets his chance when he discovers the water-tower at Elsbridge is out of order, and Thomas' crew fill him up with river-water. However, Thomas experiences pains, and an Inspector soon discovers some fish in Thomas' tank. They fish them out and have a lunch of fish and chips, and the Fat Controller tells Thomas to never fish again - Thomas heartily agrees.
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