The Central Link Light Rail began operating from the Seattle Downtown to the Seatac Airport and back last year, in 2009. On July 17, 2009 there was a preview ride, with a video! Central Link uses 35 train cars and is 15.6 miles in length.
The University Link span of the project began construction in 2009 and will be completed in 2016. This part of the project is a 3.15 mile run through two tunnels bored from Downtown running through Capitol Hill to the University of Washington. This will provide transportation (by 2030) for 70,000 riders per day to the U and Husky Stadium. Click here for an airiel view of the UW station.
There is also an exciting East Link option, although not scheduled to start construction until 2013 or 2014. This will run under I-5, a stop on Mercer Island, through Bellevue, through Overlake Station near the large Bellevue border Microsoft campus, and end in downtown Redmond.
A Northlink project is scheduled to run from the U District, at Brooklyn Station, through Roosevelt Station, through Northgate Station, and hence all the way to Lynnwood. This schedule for construction is currently being developed.
Love this Ride the Light Rail Time Lapse from YouTube!