Shanghai Subway System Map Source: china-tour.cn
Below is a list of the longest subway/metro systems in the world, based on a minimum length of 100 kilometers. These do not include street trams, light rail, or commuter railroads, only subways/metros.
Of those cities identified below, 14 are located in Asia, 9 in Europe, 5 in North America, and 1 (Santiago, Chile) in South America. No cities in Africa or Oceania have metro systems that meet the minimum criteria of 100 kilometers. China has the most of any single country with 8; followed by the United States with 4; and then Germany, Japan, Russia, South Korea and Spain with 2 on the list.
- Shanghai, China = 538 km
- Seoul, South Korea = 468 km
- Beijing, China = 465 km
- London, UK = 436 km
- New York City, NY/NJ, USA = 418 km
- Moscow, Russia = 325 km
- Tokyo, Japan = 316 km
- Madrid, Spain = 293 km
- Guangzhou, China = 240 km
- Mexico City, Mexico = 227 km
- Paris, France = 214 km
- Delhi, India = 190 km
- Washington, DC/MD/VA, USA = 188 km
- Nanjing, China = 179 km
- Shenzhen, China = 178 km
- Hong Kong, China = 175 km
- Chongqing, China = 168 km
- San Francisco-Oakland, CA, USA = 167 km
- Chicago, IL, USA = 165 km
- Singapore, Singapore = 153 km
- Berlin, Germany = 152 km
- Tianjin, China = 135 km
- Busan, South Korea = 130 km
- Osaka, Japan = 130 km
- Taipei, Taiwan = 121 km
- Saint Petersburg, Russia = 113 km
- Stockholm, Sweden = 106 km
- Hamburg, Germany = 104 km
- Barcelona, Spain = 103 km
- Santiago, Chile = 103 km
Source: https://en.wikipedia.org/wiki/List_of_metro_systems
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Panethos 
Berlin’s U-bahn is not entirely underground. At the same time, Berlin’s S-bahn includes underground stations. Combined the system serves metro travel. I wonder where Berlin would stand if the U bahn and S bahn were combined?
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