Shanghai, metro carries 2. 8 billion riders yearly

2020 CEShanghai, China

"The third oldest metro system in China (after the Beijing Subway and the Tianjin Metro) is also the busiest. The Shanghai metro carried an estimated 2. 8 billion riders over its 462 miles of track in 2020 according to the Chinese Ministry of Transport, which puts it as second of busiest metro systems after Seoul. Though it might only be a runner up in terms of passenger numbers, its 462 miles of track make it the world’s longest."

Joshua Minchin, "The top 10 busiest metro systems in the world," Intelligent Transport, March 12, 2021.

Image: DCInfo, CC BY-SA 4.0, via Wikimedia Commons