Hong Kong transportation enthusiast preserves lost voices of the city's subway

Nicholas Louie Wai-ting, a 31-year-old local transportation enthusiast, operates a website dedicated to public transport in Hong Kong. The website has an archive of more than 1,400 MTR and KCR (the Kowloon-Canton Railway) announcements. He tells the SCMP why and how he collects the annoucements.