Freight railroads account for over 40% (by weight) of the nation¿s freight on a privately owned network that was largely built almost 100 years ago and includes over 76,000 railroad bridges and over 800 tunnels. This report provides information on this infrastructure, addressing: (1) the condition of railroad bridges and tunnels and their contribution to railroad congestion; (2) the federal role in overseeing railroad bridge and tunnel safety; (3) the current uses of public funds for railroad infrastructure investments; and (4) criteria and a framework for guiding any future federal role in freight infrastructure investments. The author reviewed fed. bridge safety guidelines and reports, conducted site visits, and interviewed railroad officials. Includes recommend. Ill.