History of rapid transit - Wikipedia
How NYC Subway System Used to Look Over 110 Years Ago
History of the Boston Subway: The First Subway in America - History of Massachusetts Blog
On This Day: 1904, First Underground Subway - Tenement Museum
Watch The Engineering That Built the World Season 1 Episode 5 | HISTORY Channel
A short history of world metro systems – in pictures | Cities | The Guardian
A short history of world metro systems – in pictures | Cities | The Guardian
/cdn.vox-cdn.com/uploads/chorus_image/image/56774485/2004206485.0.jpg "History of NYC subway cars, from steam engines to open-gangway design - Curbed NY")
History of NYC subway cars, from steam engines to open-gangway design - Curbed NY
Boston opened nation's first subway 125 years ago
What it was like the day the NYC subway opened in 1904 | 6sqft
Where did the world's first subway train open? - Quora
The Oldest Subway Stations in the US
Tremont Street subway - Wikipedia
ASCE Metropolitan Section - First New York City Subway
Nation's First Subway Opens in Boston
The world's oldest subway lines - We Build Value
America's first subway opened in Boston 125 years ago on Sept. 1 - The Boston Globe
Early history of the IRT subway - Wikipedia
THE WELCOME BLOG | The Early Subway in New York City
Failing New York Subway? Not Always — Once There Were Chandeliers - The New York Times
Boston, First Subway in United States, 1897 Stock Photo - Alamy
In 1897 Boston Built America's First Subway to Help with Congestion and… Blizzards
The First Subway in New York City Was a Cylindrical Car Pushed by Air | Scientific American
