세상에서 가장 많은 전철을 생산한 나라는 어디인가?
China has the largest number of rapid transit systems in the world at 31, with over 4,500 km of lines and is responsible for most of the world's rapid transit expansion in the past decade. The world's longest single-operator rapid transit system by route length is the Shanghai Metro. The world's largest single rapid transit service provider by number of stations (472 stations in total) is the New York City Subway. The busiest rapid transit systems in the world by annual ridership are the Tokyo subway system, the Seoul Metropolitan Subway, the Moscow Metro, the Beijing Subway, the Shanghai Metro, the Guangzhou Metro, the New York City Subway, the Mexico City Metro, the Paris Metro, and the Hong Kong MTR.
China