Thomas & Friends Season 6 Episode 11 The World's Strongest Engine Episode Title:The World's Strongest Engine.Episode Description:Henry is sent for repairs after an accident, and the Fat Controller brings Diesel to the docks to fill in for Henry, much to the displeasure of Thomas, Percy, and Gordon. The Troublesome Trucks encourage Diesel to take them all at the same time and prove himself to be the world's strongest engine, and Diesel smugly decides to do so. He then lines up 20 trucks, but forgets to check them to make sure that their brakes are off, and as Diesel pulls on the trucks, he accidentally breaks away, plunges off the wharf, and falls into a barge on the canal. Sir Topham Hatt later sends him away again, while Henry returns to take the trucks, and the other engines are happy to have Henry back.