Valentine's Day in Vicarstown is the fourth and final book in the "Thomas in Town" series.
Percy is excited about the Valentine's Day party, but a blizzard strikes the Island of Sodor and Thomas is snowed in at Brendam. Thomas uses his snowplough to help clear the tracks and before he knows it, the day of the party arrives. All the children bring Valentines to the engines and Percy gets the most.
- Emily's chassis is red.
- Emily's safety valve is too far away from her cab in the first illustration.
- Throughout the book, Gordon's funnel and whistle are too tall.