San Francisco to San Jose Project Section: Environmental Documents - California High Speed Rail
The California High-Speed Rail Authority (Authority) has prepared the Final Environmental Impact Report (EIR)/Environmental Impact Statement (EIS) for the San Francisco to San Jose Project Section (Project Section, or project) of the California High-Speed Rail (HSR) System. The Final EIR/EIS has been prepared and is being made available pursuant to both the California Environmental Quality Act (CEQA) and the National Environmental Policy Act (NEPA).
I read the linked documents on the alternatives continued, and the planners seem very thorough, considering and eliminating a variety of options: I-280, US-101, East Bay routes, viaducts, trenches, tunnels, and most multiple-tracking options. They considered viaducts, trenches, and/or tunnels along most of the route, 4 tracks for (north) Bayshore - Millbrae, (short middle) S of San Mateo - N of Redwood City, (long middle) S of San Mateo - S of Redwood City (south) San Antonio - Lawrence, and 3 tracks for S of San Mateo - San Antonio.
They decided to continue with no extra track and the short middle 4-track option, Alternatives A and B. Both of them will require some modifications of the now-under-construction electrification infrastructure.
At the San Jose Diridon station, they considered several alternatives, including viaducts and tunnels and a new HSR station near the existing station, but they decided on three: in the existing tracks, a viaduct between Scott Blvd. and Tamien station, and a viaduct between I-880 and Tamien station. The two viaduct options follow the existing tracks north of Diridon, the Scott Blvd. crossing is between the Santa Clara and Lawrence stations, and the I-880 crossing between the College Park and Santa Clara stations. South of Diridon, the viaduct routes would depart eastward from the existing tracks at San Carlos St., go over the SW part of the I-280/SR-87 interchange, and meet the existing tracks at Willow St.