King's Cross is featured in the Harry Potter books, by J. K. Rowling, as the starting point of the Hogwarts Express. The train uses a secret platform 9¾ located by passing through the brick wall barrier between platforms 9 and 10.
Platforms 9 and 10 are in a separate building from the main station; also, rather than being adjacent so that a barrier could be between them, they are separated by two intervening tracks. Rowling intended the location to be in the main part of the station, but misremembered the platform numbering. During an interview in 2001, she indicated that she had confused King's Cross with Euston. In fact, platforms 9 and 10 at Euston are also separated by two intervening tracks.
When the films were made, the station scenes took place within the main station, with platforms 4 and 5 renumbered 9 and 10. In the film of Harry Potter and the Chamber of Secrets, the exterior of the adjacent St. Pancras station was used, as its Victorian Gothic façade was considered more impressive than the real King's Cross station.
When the first film was released, a large floor panel was placed on the ground outside platforms 9 and 10 indicating the Hogwarts Express. It was later removed. Within King's Cross, a cast-iron "Platform 9¾" sign was erected on a wall of the station's suburban building containing the real platforms 9 and 10. Part of a luggage trolley was also installed below the sign; while the near end was visible, the rest of the trolley seemed to have disappeared into the wall. It was common to see Harry Potter fans stop to photograph the trolley or try to push the rest of the luggage trolley through the wall to the hidden platform.
However due to problems with crowd numbers and renovation work within Kings Cross Station, the half-trolley has been moved to an exterior wall on Euston Road.
"King's Cross" is the title of Chapter 35 of Harry Potter and the Deathly Hallows, which is set in a dream location resembling the station. The station is also featured in the epilogue of the same book, making it the final setting of the Harry Potter series.













