SACRAMENTO, Calif. >> More than a month after the Trump administration moved to rescind $4 billion in expected funding, the future of California’s high-speed rail project remains uncertain.

The money hasn’t been reallocated yet, and California is challenging the decision. But the attempted funding cut has reignited long-standing doubts about whether the nation’s most ambitious rail project can still deliver on its promise.

The project has always carried outsized ambitions. When voters approved a $10 billion bond for the project in 2008, the plan was to connect Los Angeles and San Francisco in under 3 hours via fully electric-powered high-speed rail by 2020, at a cost of $33 billion. Then, in a second phase, the system would be expanded up to Sacramento and down to San Diego.

Since then,

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