The second city in China to open a metro system after Beijing, Tianjin has 80 miles of track that services 76 stations.
As the subway system of Busan in South Korea, this underground network has 128 stations along 81 miles of track.
Osaka Municipal Subway
An integral part of the extensive mass transit system of Greater Osaka, the Osaka Municipal Subway runs for 86 miles and stops at 101 stations.
This rail network in the German city of Hamburg makes stops at 68 stations along 86 miles of track.
Mass Rapid Transit (Singapore)
Spanning the entire city-state of Singapore, the MRT services 89 stations along its 91 miles of track.
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Which metro system do you think is the most impressive? Which have you used? Share your thoughts in the comments below!