>>974637Caltrain doesn't want to rebuild all their stations, when CAHSR will only share about four (SF, Milbrae, RWC, SJ). Also if Dumbarton rail ever happens, and they're able to access the east bay, the only cars that work over there are ones that use 8-inch platforms. This is particularly relevant if Caltrain ever gets their own transbay tube. Making a special snowflake train is the easiest way to just make it all werk, and allows them to upgrade everything piecemeal.
