UTL is about exploring past, present and future urban technologies in science and fiction, etc...
https://en.wikipedia.org/wiki/Chicago_L
https://www.transitchicago.com/blueline , https://www.transitchicago.com/redline/
https://www.transitchicago.com/about/
https://www.governing.com/assessments/chicagos-l-the-ugly-duckling-that-made-a-city.html