Super efficient. Regarding no-speaking rules, too
much so.

10.Tokyo Subway introduces new number system
 
Tokyo's rail system is legendary. Super-fast, super-punctual, super-everything. Some 102 train lines, an estimated 14 billion passengers per year. By most measures, they should take first place on this or any other list.
But because you cannot, ever, use your phone while moving, we're going to controversially take them down a peg. We like to talk when commuting, even if only to complain about the excessive cleanliness.
Take a seat in second spot, Tokyo. Mind the gap.