Hong Kong’s rail operator has launched a new advertising campaign featuring veteran actor Kent Cheng Jak-si, aiming to discourage the long-standing commuter habit of walking on escalators after reports of more than 500 related accidents annually. In the MTR Corporation’s promotional video, to be shown in stations and on social media, the 75-year-old actor demonstrates safe escalator use, drawing on a catchphrase from his role as the ancient Chinese politician Dong Zhao in a 2012 TVB...