Number of lines is an irrelevant metric, especially when you think about the fact that there are multiple private operators in Tokyo, and thus multiple competin

Number of lines is an irrelevant metric, especially when you think about the fact that there are multiple private operators in Tokyo, and thus multiple competing lines in various places. Compared to Paris where lines were always centrally planned, and thus there is only overlap if there are capacity issues (lines A, 1, to a lesser extent 14 and E). Length of track will similarly be skewed towards the city with the overlapping competing lines. Passenger kilometres travelled, number of trips, etc are more relevant.