Sound Transit, a US public transit agency serving the Seattle metropolitan area, has selected a joint venture (JV) comprising Stacy and Witbeck and construction company Kuney to build the Downtown Redmond Link Extension.

The $729.27m contract includes the design and construction of a 3.4mile-long stretch, which extends the Blue Line from the Redmond Technology Station to Downtown Redmond.

The scope of the contract also includes the delivery of a 1,400-space parking garage, the overhead catenary system, traction power substations, train control and communications, special trackwork and other associated utilities, street and trail improvements.

The JV will build two stations at SE Redmond and Downtown Redmond on the extension.

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Sound Transit CEO Peter Rogoff said: “Today we are another step closer to reliable, congestion-free travel to downtown Redmond and throughout the region.

“When Downtown Redmond Link opens as an extension of the Blue Line in 2024, light-rail will extend from Redmond to Bellevue, Seattle, Lynnwood and Federal Way.

“With connections to bus rapid transit and local transit services, people will enjoy increased mobility across a greatly expanded transit network.”

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The US transit agency has also approved an allowance of up to $50m authorising the project team to assess alternative concepts during the procurement process, which will increase project costs.

The Downtown Redmond Link Extension project forms part of Sound Transit’s strategy to build a 116-mile regional light-rail system by 2041.

Several projects are currently under various stages of construction. In 2021, the Northgate project, which will add three new stations to the Red Line, is scheduled to open.

Additional extensions to Blue Line, Shoreline, Mountlake Terrace, Lynnwood, Kent/Des Moines and Federal Way are also planned.

In April, the company secured key approval from the Federal Transit Administration (FTA) to advance the Federal Way Link Extension to the engineering phase.