There are also live updates here: https://www.bbc.co.uk/news/live/cm2zvjx1z14t

He added that the only thing people in his carriage could use against the attacker was a bottle of Jack Daniel’s whiskey, leaving them “praying” that he would not enter the carriage.

You probably had keys. Not terribly imposing, but if someone traps me in a confined space and is trying to knife me, I intend to be doing my best to put one of my keys through his eyeball.