The scene is also the opening of the Harry Potter and the Cursed Child stage play currently performing in London.
This particular year was special because the epilogue which ends Harry Potter and the Deathly Hallows, which takes place 19 years after the end of the main story, chronologically takes place in 2017.
Albus Potter, the second son of Harry, who is leaving for Hogwarts for the first time, is the primary character of the play, and fans wished him well precisely at 11 am, the moment at which the Hogwarts Express always leaves the station.