Woa. . . sorry to be a bit late in posting because I know what I am going to say has probably been said!
Anyway, not good, considering it is school trip season and a day before main summer holidays! Just hope nobody was seriously hurt!
Must have been a major crash, the ride is really rough going into that tunnel normally so going in like that must have been horrible!
Big, big shame this had to happen, and there are bound to be people who will sue. But as Dan said, it is not ATs fault. I am sure loads of checks happen in the morning etc. I really hope RMT isn't slowed down after this, because that would be a shame!
But I hope the people involved get better!