Construction of the world’s first light rail on a floating bridge to start next month in Seattle


Engineers have to ensure the bridge will remain buoyant when a pair of 300-ton trains pass each other, and that the high-voltage current that powers the trains won’t stray into the bridge’s pontoons and corrode its steel rebar. They spent $53 million just to design the section across Lake Washington.



The Lacey V. Murrow Memorial Bridge is a floating bridge that stretches across Lake Washington, connecting Seattle and Bellevue through Interstate 90 freeway.

This April the final design promising to replace the center express lanes of I-90 with full speed light rail was signed off. 

Subject to much controversy, Sound Transit has engineered and field-tested unique joints in order for the rail to account for the bridge's movement and weather conditions.

Rail service is projected to begin in 2023.

Anastasia Tokmakova via Archinect - News http://ift.tt/2qpFfCT

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