Ghost Train is the 50th episode of Thomas and Friends
Percy is telling Thomas and Toby the story of a ghost train that his driver told him the night before and is afraid to think of it. However, Thomas doesn't believe a word and runs off calling Percy a silly little engine. Percy tells his driver that Thomas didn't believe in the ghost and Percy's driver explains that he doesn't either; it was a story on television. Percy can't help but be disappointed.
That evening, after his work at the harbour is done, Percy runs light back to the shed. Percy enjoys running at night and knows exactly where he is despite the dark. What Percy doesn't know is that a broken cart of lime is ahead on the tracks. While Sam the farmer has gone for help, Percy comes down the line and smashes the cart to pieces and the lime completely covers Percy, who runs to the nearest signal box.
At the signal, Percy meets Toby and his driver explains to the signalman what happened. The signalman arranges to sort out the hazard on the line but suggests Percy be cleaned up as he looks like a ghost. This gives Percy an idea to scare Thomas and asks aren't to be cleaned until he plays his trick. Toby agrees to help.
At the shed, Thomas is preparing to take his evening train, when Toby, pretending to be scared, arrives and tells him that Percy has had an accident. Thomas is concerned for Percy but also worries that this will make him late. Toby tells him the line has been cleared, but that he thinks he saw Percy's ghost. Thomas is unconcerned and tells Toby wasn't to worry.
After this, however, a ghostly voice comes from outside demanding to be let in. Thomas is frightened as the shed doors open and reveal what appears to be Percy's ghost. Thomas, terrified, quickly runs off to collect Annie and Clarabel.
The next morning, Thomas finally returns and meets Toby at the station. When Toby asks what happened, Thomas reveals he slept in the goods shed claiming he didn't want to intrude as Toby would be sad about Percy. However, as he makes his excuse, Percy whistles in the distance and allows Thomas to run off, still scared.
Percy, who is now cleaned up and none the worse for his adventure, arrives having heard everything. Percy cannot help but be pleased as Toby remarks that Thomas is acting as if he had seen a ghost.