The Hogwarts Express reference article from the English Wikipedia on 24-Apr-2004
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Hogwarts Express

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The Hogwarts Express halted at a train platform
The Hogwarts Express is a fictional magical train in the Harry Potter series of books. It is ridden by students between London and Hogwarts. The train stops at King's Cross station platform 9¾, which is invisible to Muggle eyes and is reached through the barrier between platforms 9 and 10. Upon disembarking the train at Hogwarts, first years are treated to a ride across the lake by Hagrid, all other students are carried in coaches drawn by invisible (to most) creatures called thestrals.

Harry Potter met his two best friends Ron Weasley and Hermione Granger on his first ride on the Hogwarts Express. So far he has been on the train nine times- twice a year for each of his first five years at Hogwarts except once, in Harry Potter and the Chamber of Secrets when he flew with Ron in a bewitched Muggle car, which crashed on landing and escaped into the woods (The car later saved him from the gigantic spiders in the forbidden forest). After each school year, Harry was met by his uncle and aunt after getting off the train; even though they hate him very much, they have never failed to pick him up.

The Hogwarts Express is a steam train only in appearance and somewhat in function. The train is a magical device. It borrows its form and its intended function from real steam trains, but not the technology.

The Real Thing

The locomotive used in filming is a Great Western Railway Hall Class Ogden Hall. The film was filmed at Kings Cross railway station and the North Yorkshire Moors Railway

Models

An OO gauge model is produced by Hornby [1], though this is of a Castle Class locomotive rather than a Hall Class.