The California High-Speed Rail Authority (CHSRA) and the Federal Railroad Administration (FRA) in the US have revised the 2010 American Recovery and Reinvestment Act (ARRA) grant agreement.
The amended version is better aligned with the current status of the programme, which aims to deliver an operable segment connecting the Silicon Valley with the Central Valley by 2024.
CHSRA CEO Jeff Morales said: "High-speed rail construction is underway in California and this agreement is consistent with our efforts to connect Silicon Valley and the Central Valley by 2024, and then move forward with connecting San Francisco to Los Angeles.
"This amendment makes a number of technical fixes and updates the document to reflect the board’s recent approval of the 2016 Business Plan and the Legislature’s commitment of cap and trade proceeds to the project."
Grant amendments are used to manage complex joint federal-state projects.
The revision makes various technical fixes and other adjustments to reflect the changed circumstances around the programme, as well as to mark progress made by CHSRA.
Under the revision, the initial construction segment of the project has been postponed from 2018 to the end of 2022.
Another key amendment is the project schedule revision from 2018 to 2022 in order to incorporate the Central Valley segment into the operating segment.
Commenting on the changes, US businessman Jeff Denham said: "The hard-working American taxpayer has a right to know where their money is being spent and the Administration has failed to provide oversight of a flawed project."