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10 Oldest Subway Systems in the World (Updated 2024)
History of rapid transit - Wikipedia
Subway | History, Transportation, Cities, & Facts | Britannica
History of the Boston Subway: The First Subway in America
How the world's first metro system was built - Christian Wolmar
The Race to Construct the First Subway - YouTube
The World's Oldest Metro Systems - WorldAtlas
Unveiling the World's Oldest Metro Systems - Railway Technology
The First Subways - Encyclopedia.com
History of the New York City Subway - Wikipedia