SFist reports that the Merced-to-San Jose segment of the High Speed Rail Line, in latest environmental documents released on Friday has increased the estimated to cost $19 billion, up 40% from the last estimate.

A planned 13.5-mile tunnel through a mountain at Pacheco Pass, which is part of the "preferred route" for the rail line is given as the biggest reason for the huge increase in the cost estimate.

https://sfist.com/2022/03/01/13-5-mile-tunnel-drives-up-cost-estimate-for-bay-area-high-speed-rail-link/

For the environmental documents by the California High Speed Rail Authority:

https://hsr.ca.gov/programs/environmental-planning/project-section-environmental-documents-tier-2/san-jose-to-merced-project-section-final-environmental-impact-report-environmental-impact-statement/