Same here in London on the tube - if you need to wait more than 5 minutes you know that you basically have zero chance getting on the train that does arrive bec

Same here in London on the tube - if you need to wait more than 5 minutes you know that you basically have zero chance getting on the train that does arrive because it will be literally full of people - not just no seats left, but every possible available bit of physical space will have someone contorted into it, and the doors will slide against someone's back/arms/face as they slide close. There are only 4 doors per carraige on most trains, which means physically getting people in an out when it is entirely full is difficult. I've often thought that a train with no seats would be great, or ones where the entire side of the carriage just lifts up or rolls-up like a roller shutter would be a great timesaver and make everyone's lives a lot easier