Construction on the SMART commuter rail system through Sonoma and Marin counties got underway Tuesday.
The work included surveyors taking measurements at Railroad Square in Santa Rosa and crews putting up signs announcing that construction is taking place.
The Sonoma-Marin Area Rail Transit Board of Directors on Monday voted unanimously to approve a $103.3 million contract with Alameda-based Stacy and Witbeck Inc. and Herzog Contracting Corp. to build the first phase of the project.
Service is expected to begin in late 2015 or early 2016.
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