The red steam engine which took Harry, Ron and Hermione to Hogwarts is to go on display at the Warner Bros Studio Tour. The 78-year-old locomotive featured in the Harry Potter film series has been redesigned by original crew members and an Oscar-winning special effects artist. Visitors will be able to hop on board 5972 Olton Hall, which weighs 75 tonnes, as part of a new exhibit opening at the London attraction on March 19.