Calgary and Seattle, etc.

http://www.subways.net/canada/calgary.htm,
http://www.calgarytransit.com/pdf/ct_lrt_network_plan.pdf

http://en.wikipedia.org/wiki/C-Train#Further_underground_infrastructure,
http://www.liveleak.com/view?i=eeb_1379746189,
http://www.youtube.com/watch?v=V7YBZvhVwgk&feature=player_embedded

http://www.barp.ca/bus/lrt/calgary/anderson.html


http://en.wikipedia.org/wiki/Downtown_Seattle_Transit_Tunnel,
http://www.youtube.com/watch?v=etT_wVuKy_I

http://vimeo.com/67444394,
http://cablecarguy.blogspot.ca/2010/08/transit-tunnel-august-20-2010.html,
http://www.flickr.com/photos/pasa/5883321327/in/set-72157626932997637

http://en.wikipedia.org/wiki/Central_Link#Stations,
http://en.wikipedia.org/wiki/Beacon_Hill_(Link_station)

http://www.pugetsoundmagazine.com/articles/a001/10004.php,
http://railforthevalley.wordpress.com/2010/05/03/seattle-transit-kemper-freeman-is-suing-to-stop-light-rail-expansion-to-eastside

https://www.google.ca/search?q=seattle+bus+tunnel

http://www.calgaryherald.com/news/Calgarians+envision+their+communities+years+into+future/5994332/story.html