List of metro systems - Wikipedia
Map: Economic Might by U.S. Metro Area
Why don't more U.S. cities have metro systems like New York? - YouTube
List of metro systems - Wikipedia
Is Washington's Metro Improving? After $150 Million, Maybe - The New York Times
U.S. Congress to scrutinize Washington subway system after derailment | Reuters
The Busiest Rapid Transit Systems In The United States - WorldAtlas
Metropolitan statistical area - Wikipedia
Map of America's 50 Largest Metropolitan Areas by Populations - Vivid Maps
50 Largest Metropolitan Areas in the United States (v2) : r/MapPorn
Mapped: The Salary Needed to Buy a Home in 50 U.S. Metro Areas
Chinese train manufacturer wins US metro deal - Business - Chinadaily.com.cn
When Will the U.S. Build Another Subway?
US Metro Bank - Putting People Ahead
Why Public Transit Ridership Is Down In Most U.S. Cities | Here & Now
The 10 U.S. metro rail systems that lose the most money per passenger
Is Washington's Metro Improving? After $150 Million, Maybe - The New York Times
Some but not all US metro areas could grow al | EurekAlert!
The Busiest Rapid Transit Systems In The United States - WorldAtlas
Stadler Wins First Metro Contract in the US: 127 Trains for Atlanta | Railway-News
Largest 50 Metros
Making Custom Metro Maps -- GIS Resources
Best US Cities for Public Transportation, Ranked: WalletHub Study
U.S. Congress to scrutinize Washington subway system after derailment | Reuters
Best US Cities for Public Transportation, Ranked: WalletHub Study
