https://en.wikipedia.org/wiki/Central_Link
https://en.wikipedia.org/wiki/Central_Link#Stations
http://www.seattletimes.com/seattle-news/transportation/sound-transit-keeping-close-eye-on-crowded-light-rail-trains/
https://en.wikipedia.org/wiki/Pioneer_Square_station ,
https://en.wikipedia.org/wiki/Seattle_Underground
https://en.wikipedia.org/wiki/Union_Station_(Seattle)
https://en.wikipedia.org/wiki/East_Link_Extension_(Sound_Transit)
