In the Drink is a 1991 annual story.
Trevor the traction engine loves being given unusual jobs. He and Jem Cole are called to pull some old cherry trees out of the ground. After some exhausting work, Trevor goes to a stream to be refilled. But as his tank fills, Trevor almost ends up stuck in the mud when the earth on the bank slips. As he trundles back home, Trevor says that whenever he goes on a long journey in future, he will always be careful where he stops for a drink.