Learning something is quite easier compared to unlearning what you have already learned.
At one point, the citizens were instructed to stand to one side (to the right) to make rooms for those who need to walk up the escalator. After several years of such promotion of public behavior, the subway system administrators are trying to reverse the pattern and reeducate the public not to walk up the escalator. So far, such social reprogramming doesn’t seem to produce immediate results as people are so much used to the older way of standing to a side.