Santa Clara Valley Transportation Authority (VTA) of California in USA chooses Herrenknecht as their Tunnel Boring Machine needs.

The $76 million TBM will be one of the largest such machines ever to be built. It will bore the tunnel for the BART Silicon Valley Phase II Project (BSVII) with five miles of train tracks in both directions and three station platforms. VTA will make multiple payments will be made to Herrenknecht at key milestones of design, production, delivery, assembly, and launch of the TBM.

The diameter of the TBM will be 54 feet (more than 16 meters) and it will be the third largest TBM ever built in the world.

According to VTA;

Approximately 18 months after manufacturing begins, the TBM will be shipped from Kehl, Germany across the ocean to California to be reassembled on-site at the West Portal, located at the future Newhall Yard. Reassembling the TBM will take approximately 6 months on-site before it is ready to be launched.  

The TBM will launch at the West Portal and will dig 30 to 40 feet each day traveling east towards the Berryessa/North San Jose BART Station, taking approximately 3 to 4 years to complete the 5-mile-long tunnel. Once tunneling is complete, the TBM will emerge above ground at the East Portal on the east side of US 101 near Las Plumas Avenue. Once it reaches the surface it will be disassembled, and the remaining parts and material are planned to be reused to the extent possible.

https://www.vta.org/blog/vta-purchases-tunnel-boring-machine-bsvii-project