The NYC subway also has more riders (about 25%), more lines (about 2x), more stations (about 3x), and more miles of track (2-5x depending on how you count). It'

The NYC subway also has more riders (about 25%), more lines (about 2x), more stations (about 3x), and more miles of track (2-5x depending on how you count). It's also the only system in the world that I'm aware of that runs 24-hours a day, which impacts the ability to do routine maintenance. [1] http://en.wikipedia.org/wiki/MTR http://en.wikipedia.org/wiki/MTR [2] http://en.wikipedia.org/wiki/New_York_City_Subway http://en.wikipedia.org/wiki/New_York_City_Subway