Use HSR construction to extend BART

This isn't to say that BART should get a free (sic) ride. Instead, the offer should be made for BART to pick up the tab for the inclusion of features in certain key structures constructed by HSR that would make a future BART extension cheaper.

This would be only relevant for parts of the Bay Peninsula and San Francisco to Sacramento extension, and most likely would take the form of extensions to station foundations to permit future excavations for BART platforms (ie, 100' down instead of 50').