Silicon Valley Berryessa Extension Design-Build Project – Bay Area Rapid Transit (BART)

Fremont, Milpitas, San Jose California

The VTA Silicon Valley Berryessa Extension consists of the design and construction of a 10-mile extension of the Bay Area Rapid Transit (BART) system into Santa Clara County. The extension connects to the track south of the BART Warm Springs Station and proceeds in the former Union Pacific Railroad (UPRR) corridor through Milpitas to the Berryessa District of San Jose, near Las Plumas Avenue. The alignment is a combination of at-grade, open-cut, and aerial guideway configurations, and includes a retained-cut passenger station in Milpitas (Milpitas Station) and an above-ground passenger terminus station in San Jose (Berryessa Station). The project also included a two-cell, cut-and-cover tunnel under a major intersection, five overcrossings over heavily used city streets, and restoration and enhancement of a portion of Upper Penitencia Creek to create a more natural channel with a widened floodplain and riparian habitat.

LAN served as design manager and lead designer. The firm’s design services included civil engineering, structural engineering, drainage, hydraulics and hydrology, utilities, traffic planning and maintenance of traffic, geotechnical engineering, environmental engineering, trackwork, systems, and architecture/engineering for two large stations. LAN also provided right-of-way services for the project by maintaining master right-of-way files and identifying and processing property acquisition requests to obtain additional right-of-way or additional easements as needed.

At a glance

$772 million design-build project cost

$2.3 billion estimated contract cost

LAN is lead designer responsible for a 10-mile portion of the 16-mile extension

A major stakeholder, Union Pacific Railroad owns tracks parallel to the corridor for approximately 5.5 miles, and has a major rail yard in Milpitas

One of the design units included the construction of a shoofly to maintain rail service to Union Pacific Railroad

Fast-track design

The 10-mile project was divided into 31 design units

Two Stations; one below grade and one aerial


LAN has developed more than 70 alternative technical design concepts for the project–more than 20 of which have been implemented after owner approval.

Funding for the project comes from local, state and federal sources

Relocated approximately 700 LF of 60-inch water transmission pipe from the aerial station footprint

Utilizing lightweight cellular concrete (LCC) backfill for mechanical stabilized earth approaches. The use of the LCC alleviated soil subsidence and a potential drawdown of bridge piles and neighboring structures. First of it’s kind for a rail corridor in the U.S.


Construction Mgmt & Inspection


Structural Engineering

Transportation Services


Bay Area Rapid Transit (BART)

Related Work

Construction Management

Transportation Services

Rail and Transit

Structural Engineering