What I like about Hong Kong's MTR is the multi languages announcement. They can do it in 3 languages, English, Cantonese and Mandarin. This reflects the city's society as a whole.
Whereas my home country, Singapore, can not do it in 4 languages, English, Mandarin, Bahasa Melayu and Tamil.
Hence, if you have the chance to visit the city, be amazed on their subway systems and the policy in running the trains. Even this minute detail, train announcements, reflect careful planning.