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Sound Transit’s board recently awarded the construction contract for the Sounder D-to-M streets track and signal project to MidMountain Contractors Inc. The project calls for building a new commuter-rail line from East D Street to South M Street in Tacoma, Wash.

Work is expected to begin in late September. When complete, the D-to-M streets track will connect with the existing M-to-Lakewood segment, extending Sounder south line service from Tacoma Dome Station to Bridgeport Way in Lakewood. Service to Lakewood is expected to begin in 2012.

The contract is valued at $40.8 million, $25.6 million below the Sound Transit engineer’s estimate of $66.4 million, Sound Transit officials said in a prepared statement.