Really Useful Engine, alternately titled A Really Useful Engine and He's a Really Useful Engine, is the first song and music video in the UK from the fourth series dedicated to Thomas. In the US, it was first introduced in the Mr. Conductor's Thomas Tales episode, Missing Whistles. An orchestral and shortened version of the song, with the original children's voices and added backup vocals by Steven Page, was used in Thomas and the Magic Railroad. A third version was made, with vocals by Robert H