Federal Transit Administration: Rail Modernization Study: Report to Congress, April 2009 [open pdf - 4MB]
The report assesses the level of capital investment required to attain and maintain a state of good repair (SGR) for the Nation's seven largest rail transit operators. The study estimates the total value of the existing backlog of over-age assets at these agencies. It also considers reinvestment needs within the context of past levels of Federal funding support as well as potential changes to the current Federal program.
Federal Transit Administration (FTA): http://www.fta.dot.gov/