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Metro / Subway Rapid Transit System
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Chen Weihua （陈卫华） on X: "Beijing has the second longest subway system in the world. As of 2023, the country with the most metro systems is China, with 45 in operation. Truly
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Study shows subway systems develop in remarkably similar ways
List of metro systems - Wikipedia
Top 100 Longest Metro (Subway) Systems Comparison (2019) - YouTube
Top 100 Longest Metro (Subway) Systems Comparison (2019) - YouTube
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The World's Oldest Metro Systems - WorldAtlas
