Day of the Diesels sees two new steam trains "steamies" arrive on the island of Sodor; Belle, a vibrant blue and red female train with water jets to put out fires, and Flynn, an American fire truck with two sets of wheels, one for roads and one for rail tracks. Their arrival is greeted by all, though more so by Thomas, who takes time out to show them around.
To balance up the new entries to the island, the steamies' rivals, the diesels, also gain two new trains and we get to see their home for the first time, the diesel works.
For those who love the series and previous films, you will not be disappointed. The new trains fit in very well and they end up interacting with all of the old familiar faces. An enjoyable film, especially for the kids and one not to be missed for true 'Thomas' fans.