A celebration for the completion of the new SR 520 bridge, the world’s longest floating bridge, is happening this weekend in Seattle, though it won’t be open to traffic for a few weeks.

Contractors are fastening customized tracks and ties in the former I-90 center express lanes, the most innovative segment in a $3.7 billion light-rail corridor from Seattle's Chinatown ...

Sound Transit began light rail testing on the I-90 floating bridge in Seattle Wednesday. The unpowered car was pulled from the Mercer Island station to the Judkins Park station.

Sound Transit has discovered another construction problem with its future Seattle-to-Bellevue light-rail extension, this time on the I-90 floating bridge deck.

Photos courtesy of Sound Transit Once Sound Transit’s trains start crossing the final 2 Line segment, they will be the first light rail vehicles in the US to cross a floating bridge.