The Shanghai Metro is one of the most rapidly expanding Metros in the world. A guy who lived in Shanghai in 2008 said it only had 7 lines before the Expo. Now it has nearly twice that many. By 2020 it is expected to have 142 lines and stretch from Chengdu to the California coast.
Like Taiwan, the Shanghai Metro is very well laid-out and well maintained. Its cleanliness puts the New York subway to shame. When the train stops, the subway doors line up with automated entrance gates on the platform so people know exactly where to line up. Not that they do. Or if they do, the lines are forgotten once the subway arrives. Then it’s every nánzǐ (男子) for himself.
Unlike Taiwan, the Shanghai-ese do not believe in letting people off the subway before getting in. This is, I assume, the result of a communal decision it’s more important to catch the next train than to deboard at one’s intended stop.