The picture shows one vacant space but otherwise very little of the train and its passengers. It is possible there were many people standing behind the photographer but no-one wanted to squeeze into a window seat involving asking someone to move. I frequently use trains where a number of people are standing but there are a small handful of vacant seats, so it could be the case that even if some standing passengers could find a seat, there would still be some standing passengers.I don't know how you derive that - the picture shows at least one passenger seat empty and no-one standing. The question is; is the area closed off for the entirety of every journey, and when it IS packed, what is the reaction of passengers?