Report at HPANA
HPANA got a set report from someone who claimed to be an extra on the Hogwarts Express shoot. They had this to say on it...
I live in Scotland and over the weekend I was fortunate enough to be one of those 100 students who were used as extras when Harry Potter 4 were filming at the Glenfinnan Viaduct. It was like a dream come true for such an avid Harry Potter fan like me.
Unfortanately Dan [Radcliffe], Rupert [Grint] and Emma [Watson] weren't there. Instead, they had three doubles, which was still cool. I was able to talk to them for a bit. They seemed really nice. I think the Harry double said that his name was Ryan, the Ron double's name was Ricky. I remember that because I remember him joking that the knitted "R" on his Weasley jumper really stood for Rickie and not Ron -- ha ha. Hermione double's name was Jo and she was like 24 but she still looked like Emma. They said that they were staying in a hotel in nearby Fort William and that Dan, Rupert and Emma were filming a different scene down in London.
Unfortanately Dan [Radcliffe], Rupert [Grint] and Emma [Watson] weren't there. Instead, they had three doubles, which was still cool. I was able to talk to them for a bit. They seemed really nice. I think the Harry double said that his name was Ryan, the Ron double's name was Ricky. I remember that because I remember him joking that the knitted "R" on his Weasley jumper really stood for Rickie and not Ron -- ha ha. Hermione double's name was Jo and she was like 24 but she still looked like Emma. They said that they were staying in a hotel in nearby Fort William and that Dan, Rupert and Emma were filming a different scene down in London.


For the full report, go to HPANA
They also have three pics of the Hogwarts Express taken from a mobile phone of the extra.