Sometimes you just have to know when to walk away. California has officially withdrawn its lawsuit against the Trump administration over $4 billion in pulled federal funding for the state's perpetually embattled high-speed rail project.

The California High-Speed Rail Authority filed the dismissal on Friday, ending its legal challenge to the U.S. Transportation Department's decision to yank funding from the ambitious transit initiative. The Trump administration's rationale? The authority didn't have a credible plan to actually complete a meaningful chunk of track in California's Central Valley.

Here's where things get expensive: the project now carries an estimated $100 billion price tag, and the state is scrambling to identify alternative funding sources to keep it on track.

The funding drama escalated last September when the Trump administration reallocated $2.4 billion originally earmarked for California's high-speed rail to a $5 billion nationwide program designed to upgrade passenger rail services across the country.

Interestingly, the California High-Speed Rail Authority is striking an optimistic tone despite losing the lawsuit. Officials suggest that moving forward without federal involvement might actually give them more flexibility to adopt global best practices without Washington looking over their shoulder.

The rail funding dispute is just the latest chapter in a years-long tension between Trump and California. The relationship has been marked by political sparring with Governor Gavin Newsom, legal battles over immigration and environmental policies, and repeated federal interventions in state affairs.