From the Dumbarton Corridor FAQ:

"What is the anticipated timeline for the project? Following the completion of the Alternative Analysis in Spring 2021, the District, in partnership with MTC, will evaluate the timing of appropriate next steps. The project is part of Plan Bay Area 2050 to be completed approximately by 2036."

This may take a while, folks.

I researched a re-build of the Dumbarton Trestle over 10 years ago when the topic came up before the Menlo Park City Council. I discovered studies wherein divers had analyzed the foundations and found them (concrete and rebar) deteriorated beyond repair. Even then, the projected costs of refurbishing this trestle were staggering. Current seismic safety standards will demand a safe, secure and reliable track system that did not previously exist.

Here's a clue to possible future trestle cost estimates: The 2008 California high-speed rail bond issue (Prop. 1A) promised a train system costing $33 billion. Today the cost forecast is $100 billion and they've merely started construction, and are again raising cost estimates dramatically. In the US, such cost inflation has become standard for very large infrastructure projects. (See: Boston Big Dig, for further examples.)

At the time of this prior Dumbarton trestle interest, the US Coast Guard also had a concern, seeking removal of the entire structure. Any rebuild will have to take South Bay ship navigation interests into account.

I certainly hope that all the interested parties do their due diligence before coming to us taxpayers asking for a blank check.

"I certainly hope that all the interested parties do their due diligence before coming to us taxpayers asking for a blank check."

When have they EVER done that? They'll just lie their asses off like they did with HSR to get the uninformed, sucker voters to vote for it then the cost will go through the roof and the taxpayers will be stuck paying for another boondoggle.