Yokohama subways have just started a campaign to stop people walking on escalators, claiming the practise is dangerous. Motivated by a flood of complaints from customers (the most poignant that of a grandparent whose grandchild was roughly shoved aside by a busy commuter - the beast!) the subway company decided to act.
Anyone who lives in Japan will be used to this kind of cossetting by private companies. My favourite is "it's dangerous so, don't put your fingers between the train doors".