Passenger Rail Investment and Improvement Act of 2008 (PRIIA)

According to a new EIA report, the cost advantages of liquefied natural gas make it an attractive alternative to diesel fuel for major U.S. freight railroad companies. Hybrid diesel-electric locomotives on order for 5 states will power HSR routes.
Apr 16, 2014   Progressive Railroading
Unless these states come to an agreement with Amtrak by Oct. 16 to help subsidize regional rail service, required by the Passenger Rail Investment & Improvement Act of 2008, Amtrak will cease operating them. Agreements were reached with 16 states.
Oct 8, 2013   Governing
Ron Nixon provides an update on the implementation of the Passenger Rail Investment & Improvement Act of 2008 that requires states to subsidize shorter Amtrak routes in order to reduce Amtrak's federal subsidy. 28 routes in 19 states are at stake.
May 6, 2013   The New York Times - U.S.