https://en.wikipedia.org/wiki/CTrain#Rolling_stock
future underground c-train stations
https://www.youtube.com/watch?v=V7YBZvhVwgk
Tunnelling under downtown is being hailed the top-option in plans to build and connect Calgary’s next CTrain lines...
http://www.metronews.ca/news/calgary/2014/03/10/underground-ctrain-tunnel-gets-top-marks-in-new-report-on-green-line.html
