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Watch BART crews install this new diamond junction in a weekend. This was part of a larger effort to replace a vital interlocking between Union City and Fremont stations that was nearing the end of its lifespan.

An interlocking is the fail-safe system that allows trains to safely move from one track to another. It’s a key piece of railroad infrastructure, and replacing it will help keep service safe and reliable for years to come.

BART continues to invest in trackside upgrades, track replacement, and modern train control technology to make the system even more resilient.