These are the 10 Oldest Subway/Metro Systems in the World - YouTube
10 Oldest Subway Systems in the World (Updated 2021) - Oldest.org
trains - Oldest subway/underground/metro rolling stock still in operation - Travel Stack Exchange
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History of rapid transit - Wikipedia
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The world's oldest subway lines - We Build Value
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London's system is the oldest underground railway in the world, dating back to 1863 Stock Photo - Alamy
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