Cynic that I am, my first thought was
"I bet there's no-one standing in the gangways, they've all congregated in the doorways".
Then I remembered that it was a film of Japanese commuting, not British, so they wouldn't be so ignorant/stupid/whatever...
Mind you, shows up some of our wondrous commuters for the muppets they are, given the amount who moan when they can't get two or four seats to themselves...! 