Building light rail over a moving, floating interstate has turned a tad trickier than engineers originally envisioned.
The University of Washington will enter the fray, beginning a study of how train vibrations may impact the bridge.
The Times reports that Parsons Brinckerhoff has made solid progress on the engineering so far, though, with testing of track in Colorado showing that trains can run safely at 55 miles per hour on the bridge, for example. Sound Transit and Parsons Brinckerhoff have also established track changes needed to improve comfort when trains transition from ground to bridge.
Sound Transit still expects construction on the existing bridge to start in 2017 and adding light rail to it isn’t one of the first steps in the construction timeline.
Tim Newcomb is Engineering News-Record’s Pacific Northwest contributor. He writes for Popular Mechanics, Sports Illustrated and more. You can follow him on Twitter at @tdnewcomb or visit his website here.