Pictures and data of the actual full-size ("prototype") Western Pacific Railroad equipment can be found by following the links below.
Databases:
Database of all WP diesels (by year, color scheme(s)) with picture index
WP rolling stock paint schemes (with pictures -- long load time)
WP diesel locomotive color schemes
My Pictures:
WP Sightings in Texas
Diesels at the Portola Railroad Museum (October 2001)
Rolling Stock at the Portola Railroad Museum (October 2001)
Other Great Sources of WP Pictures:
Merrill Thurman Photo Gallery
George Elwood's "Fallen Flags" Site
David Epling's "Central California Rails" Site
John Manter's "Stockton Tower" site