When you think about UP’s Big Boys you don’t often think about all the manufacturers who provided components that contributed to that locomotive’s success. Streamliner editor Marc Entze has been able to locate a large number of ads that show just some of the companies involved in the building of Union Pacific’s 4-8-8-4s. Please click here to view a gallery of Big Boy related advertising as a companion to the article “UNION PACIFIC BIG BOY COMES HOME” featured on page 6 of The Streamliner Vol. 27 No. 4.