Great Quiz. Even though I got only 2 to 3 but still I can understand the effort you gave to make this quiz. The map is Awesome. I'm also a Rail Enthusiast. You might like my quizzes too,
HKCEC should be accepted for Exhibition Center. Apart from the MTR quiz, you may also enjoy a bus quiz in Hong Kong. https://www.jetpunk.com/user-quizzes/225907/largest-bus-termini-in-hong-kong
which are here