Did you know Hong Kong has the world's largest active double-decker tram fleet – and every one of the 165 "Ding Dings" currently in service was built by hand? At the Whitty Street depot, just 90 craftsmen keep this #Guinness World Record fleet alive, repairing and assembling each tram piece by piece. Some still run on century-old controllers and motors decades old. Step inside with our reporter Huang Fei to see the skill, heritage and heart keeping Hong Kong's iconic trams on track.