- Bill and Ben the Twin Engines discover a group of their trucks missing and their drivers let them play a trick on the diesel who took them by mistake.
- Bill and Ben are tank engine twins who work at a china clay quarry. Their jobs are to take the china clay in trucks along the main line for engines and ships.
One day, Bill and Ben arrange some trucks at Brendam's Harbour and leave to pick up more, but return to find them gone. Their drivers find a patch of oil on the ground and realize a diesel's responsible for taking the trucks. Mishearing this as "diseasel", the twins remember a notice in their shed saying "coughs and sneezles spread diseasels", and they argue over who's responsible. Their drivers intervene and make a plan to get the trucks back which involves removing the twins nameplates and making them identical to trick the diesel.
The twins find the trucks in a yard, with a large green diesel at the front. Ben hides behind, with Bill going forward to demand the trucks back. The diesel claims the trucks are his and tries to shoo Bill away, but Bill reverses behind the trucks and Ben rides forward surprising the diesel, thinking it's the same engine. This continues for a while, causing the diesel to get dizzy. The twins then reveal themselves to him.
Edward arrives at the scene and asks what Bill and Ben are doing there. They claim that the diesel stole their trucks, but Edward scolds them for their rudeness and clears the situation up. The twins apologize and the diesel forgives them. He introduces himself as BoCo and explains that he got his trucks mixed up with Bill and Ben's. Edward then sends the twins to take their lot back once they have picked up BoCo's trucks in exchange for theirs. After Bill and Ben leave, Edward tells BoCo that they don't mean any harm but can be maddening at times. BoCo laughs and replies that "maddening" is the word.
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