Central Pacific Railroad, Founders, History, & Facts
Ask MR: What were the Big Four railroads? - Trains
Harriet Tubman Day: A timeline of her life and legacy
Santa Cruz Trains: People: The Big Four
Look What Taylor Made Us Do
Cornelius Vanderbilt - Biography, Railroad Industrialist
Riding the Rails, American Experience, Official Site
The Big Four House - Birthplace of the Central Pacific RR - Clio
The Big Four - THE TRANSCONTINENTAL RAILROAD
Leland Stanford And The Big Four
The Story Behind Rube Goldberg's Complicated Contraptions
Unstoppable (2010 film) - Wikipedia