As South Bay transit officials work to bring the long-awaited BART extension through downtown San José to life, they’re also scrambling to form a “Plan B” for how to keep the project moving if President Donald Trump derails a massive chunk of pledged federal funding.

While the extension still faces many hurdles and financial uncertainties, it’s currently estimated to cost about $12.7 billion and open in 2037. Under President Joe Biden, the Federal Transit Administration last year promised $5.1 billion to support it, and local officials had secured another roughly $7 billion.

Officials from the Santa Clara Valley Transportation Authority, which is building the six-mile, four-station extension for BART, at the time celebrated the commitment from Washington and said it would be critical

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