The first phase of the Silicon Valley Extension Program expanded heavy-rail transit service in Northern California from the San Francisco Bay Area southward into the Silicon Valley. The $2.3-billion project encountered challenging site conditions that were resolved by using a lightweight cellular concrete, a tunnel to pass underneath critical utilities, and a system of cameras and sensors to increase safety near an active freight rail line. 

Northern California’s Santa Clara County might seem to have everything it needs, from the rolling hills and high-tech industries of Silicon Valley to the swaying palm trees that epitomize the laid-back West Coast

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