Rock Island F9M 4161 and GP9 1319 idle at Rock Island's Inver Grove Yard engine facility in South St. Paul. The F unit was originally built as an F3 for Union Pacific, and later upgraded to an F9 ... (more)

Rock Island 4161 is an F9AM rebuilt from Union Pacific F3A no. 1440A for UP. The unit was built in March 1948 and rebuilt in January 1959. It was one of several Fs acquired by financially strapped... (more)