Northgate Link extension
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Northgate Link extension (formerly known as "North Link") is a Link Light Rail extension in Seattle, Washington that will connect the University District to Northgate. Northgate Link will travel in two tunnels from University of Washington station, the northern terminus of the University Link Extension, through underground stations at U District and Roosevelt towards Northgate, emerging on the east side of Interstate 5 and continuing on an elevated guideway to Northgate station. The extension was approved in 2008 by voters in the Sound Transit 2 (ST2) package, began construction in 2012, and is expected to open for service in 2021.
For the Northgate Link extension project, the paired tunnels constructed for University Link will continue north to the University District and the Roosevelt neighborhoods before emerging at the surface along I-5 near NE 94th Street to serve the elevated Northgate station.
Sound Transit is preparing to extend mass transit from Northgate to Lynnwood, which voters approved as part of the Sound Transit 2 Plan in 2008, along with funding to continue planning future service all the way to Everett. This project is known as the Lynnwood Link extension project.
Construction on the Northgate Link extension began in 2012 and is scheduled to open for service in 2021. Once the extension is opened, the line will be named the Red Line.
Each 3.4-mile (5.5 km) tunnel is dug southbound, starting from the Maple Leaf Portal, in three segments separated by stations, using a 21.5-foot (6.6 m) diameter tunnel boring machine. The machine digging the tunnel for northbound trains was named "Brenda" and the sister machine for the southbound trains was named "Pamela", but the names were dropped in March 2016 to reduce associations with the troubled "Bertha" machine used on the Alaskan Way Viaduct replacement tunnel project. Brenda was previously used on the University Link Tunnel from 2011 to 2012, digging both tunnels between Capitol Hill station and the Downtown Seattle Transit Tunnel.
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