^ The bigger challenge to shared tunnels isn't necessarily technology, loading gauge or even inter-agency operation, it's capacity. Even if you could have BART share the tunnel with mainline rail or vice versa through the use of offset or gauntlet tracks - or a never in a million years BART move to standard gauge - you still are limited to how many TPH can fit through the tunnel in each direction. Even with communications based train control this would severly limit operations and future growth right out of the gate, especially with BART which would operate with a significantly higher frequency than Caltrain or any other regional or shorter distance mainline rail.
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