1) China is rapidly urbanizing and cities are expanding their public transportation networks to accommodate rising populations and car ownership.
2) Urban metro systems have expanded greatly in major Chinese cities like Guangzhou, Nanjing, Shanghai, and Beijing in recent years, with hundreds of kilometers of new lines built annually.
3) Shanghai has the largest metro system in the world with over 425km of track and 7 million daily riders, while Beijing and Guangzhou are also focusing heavily on expanding their metro networks to manage transportation needs.