The subway was my favorite part of living New York. The New York subway has more stations than any other metro system in the world (472), meaning I could just pop up just about anywhere in the city and live there entirely without a car. It was great. When I moved away, I couldn’t help but wonder — why do so few U.S. cities have subways? Resources on this topic: How Much Does Rail Transit Cost to Build and Operate: https://www.thoughtco.com/rail-transit-projects-costs-2798796 Urban Densities and Transit: A Multi-dimensional Perspective: http://www.its.berkeley.edu/sites/default/files/publications/UCB/2011/VWP/UCB-ITS-VWP-2011-6.pdf Loo, B. P. Y., & Cheng, A. H. T. (2010). Are there useful yardsticks of population size and income level for building metro systems? Some worldwide evidence. Cities, 27(5), 299–306. Video sources: - Videoblocks.com - Archive.org, Prelinger Archives Photo sources: - Flickr user A Diamond Fell From the Sky - Flickr user Atomic Taco - Flickr user Canadian Pacific - Flickr user Ian Fuller - Flickr user Michael B - Flickr user Michael Semensohn - Flickr user Paul Sullivan - Flickr user Susanne - New York MTA - Oregon Department of Transportation - Trimet - Virginia Department of Transportation Filmed in sunny Sacramento, California.