xkcd once again embraces their love of maps with Subways of North America. While I've seen similar subway map mashups, I've never seen them connected before.
These inter-city connections create some wonderful highlights. Here are some of my personal favorites:
The Cleveland Circle (Boston) to Cleveland shuttle - passing through West Trenton, this shuttle would be a nice easy way for me to leave work and go visit my Mom. West Trenton's location along Lake Erie just beyond South Harbor is also a bit curious.
The Green Line extension from Cambridge to Montreal - if it even makes it to Medford that would be remarkable.
The extension of the Market Street elevated subway line in West Philly/Upper Darby from 69th Street to Long Beach and LA.
The Rocky Mountain Tunnel (at sea level) connecting Chicago's O'Hare airport to Oakland.
A couple of extremely long subway tunnels from Atlanta and Miami to Mexico City.
The Puerto Rico submarine from Staten Island to San Juan and the connection from Jamaica (Queens) to Jamaica.
The Springfield Monorail connecting to nowhere, not even North Haverbrook.
There's lots of other things to explore including tunnels in the Caribbean, "covertly repurposed" Amtrak lines, strangely renamed Red Line stations in Quincy, Mass. and a graveyard for passengers killed by closing doors - have fun exploring!
2 years ago