Kings Cross Station

The Hogwarts Express, the only train which takes students to Hogwarts School of Witchcraft and Wizardry, departs at 11am on September 1, the day before Hogwarts students begin their school year. Students board this train from Platform Nine and Three Quarters, in Kings Cross Station.

Of course, this platform is not visible to Muggles, being, as are all large meeting places for wizards, magically concealed. In order to get to Platform Nine and Three Quarters, one must walk directly through the seemingly-solid barrier between Platform Nine and Platform Ten (if nervous, it is best to do this at a run). Once through, the barrier it is no longer visible, a wrought-iron sign reading "Platform Nine and Three Quarters" having taken its place.