I came across a couple of studies that I found particularly interesting because they rather go against the grain of popular thought.
I find escalators frustratingly slow. Why can't they be sped up? Old people can use a lift instead if they have issues. But does a faster escalator move crowds more quickly? You would think so but apparently not as a study in Moscow showed. It seems with a faster moving escalator, people leave more of a gap behind the person in front of them before they will step on to an escalator. The end result of the faster escalator test was that the same number of people were moved per hour.
The London Tube is an extraordinary beast. Within its cramped stations it moves a huge number of people quite efficiently, and although it does go wrong at times, even disruptions are generally well managed.
As an ignorant tourist, you may inadvertently do the wrong thing and stand on the left side of the escalator when using The Tube and you have made yourself a social problem to be dealt with by Londoners in various ways with a minimum of at least a filthy look. The left side is for walking, the right side is for standing, quite the opposite to here. But how to move more people up and down escalators in very busy times? An attendant with cattle prod to encourage more people to walk up and down the escalators? Only to be used on the young and fit of course. It seems the real answer is fill the escalators with people standing, leaving no room for those who like to walk. A series of trials were taken where with signage and people advising everyone to just stand on both sides of the escalator, leaving no room for walkers. The walkers, naturally, were not happy, with some becoming quite ballistic as they were stuck standing on the escalators. It is the case of a few inconvenienced for the greater good, that is clearing train platforms and stations more quickly. Will it become a permanent feature of London's Tube? Not on your nelly. Such habits are too ingrained in people although I expect it might be tolerated at the busiest stations but only with an attendant at the escalator along with some very firm signage, and of course, people will need to know why.