https://en.wikipedia.org/wiki/CTrain#Further_underground_infrastructure-
https://www.youtube.com/watch?v=V7YBZvhVwgk
http://www.nycsubway.org/wiki/Calgary,_Alberta
http://www.barp.ca/bus/lrt/calgary/anderson.html
http://forums.beyond.ca/showthread/t-283828.html
http://www.calgarysun.com/2015/08/28/calgary-lawmakers-administration-set-to-make-important-decisions-on-new-lrt-line
http://calgaryherald.com/news/local-news/elevated-lrt-being-considered-for-north-central-line
https://www.google.ca/search?q=future+8th+avenue+C-Train+tunnel+plans+for+downtown+calgary&safe=off&biw=2133&bih=1078&espv=2&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj1raCynpPKAhUO6WMKHS9uDxwQ_AUICSgD&dpr=0.9
https://www.google.ca/search?q=future+8th+avenue+C-Train+tunnel+plans+for+downtown+calgary&safe=off&biw=2133&bih=1078&espv=2&source=lnms&sa=X&ved=0ahUKEwiGt9SvnpPKAhUD52MKHaa2BoAQ_AUIBSgA&dpr=0.9