Blended Rail

It was the first of many lawsuits to hit the HSRA. Menlo Park and Atherton, joined later by Palo Alto - three adjoining cities on the San Mateo County/Santa Clara County border, among the wealthiest in the nation, sued in 2008 to reroute the train.
Mar 5, 2013   San Jose Mercury News
The alternative plan directs a sizable percentage of the initial $6 billion allocation to the Bay and LA regions to upgrade existing commuter lines at the expense of greater investment in the Central Valley. Funding plan may be determined by July 6.
Jul 2, 2012   California Watch
Knowing that a $100 billion project stood a poor chance of passing muster in a budget-conscious state legislature, Gov. Jerry Brown shaved off $30 billion by using a "blended rail" strategy in the Bay Area and South Coast, i.e. sharing tracks.
Apr 2, 2012   The Sacramento Bee - Transportation