Passenger Rail Investment and Improvement Act of 2008 (http://www.fra.dot.gov/downloads/PRIIA%20Overview%20031009.pdf): The Passenger Rail Investment and Improvement Act of 2008 (PRIIA) reauthorizes the National Railroad Passenger Corporation (Amtrak) and strengthens the US passenger rail network by tasking Amtrak, FRA, states and other stakeholders to improve service, operations and facilities.