I originally posted this information on my old website on March 26, 2009. I have since updated it.
The Bicentennial of the United States of America was celebrated on July 4, 1976, the 200th Anniversary of the signing of the Declaration of Independence. Many locomotives and other examples of railroad equipment were painted in special patriotic paint schemes to commemorate the Bicentennial.
The link below leads to a list of all the Bicentennial-painted equipment I am aware of, except for the American Freedom Train consist and the steam locomotives used to pull it, which are listed here.
Bicentennial Railroad Engines at North East Rails
Spirit of 1976 - Bicentennial Locomotives at Railroad.net
US Bicentennial Rolling Stock at The Rip Track
Bicentennial Locomotives at Fallen Flag Railroad Photos
American Freedom Train & Patriotic Schemes at the Great Plains-West Rail Galleries
Missouri Pacific's Bicentennial Units at Screaming Eagles
Alaska Railroad Bicentennial Colors at John's Alaska Railroad Page
WTCX #309 from rrpicturearchives.net
WTCX Caboose #8 in Bicentennial Colors from Central California Rails
The Story of America's Freedom Trains