Out of 25 'Big Boys' built for the Union Pacific in 1941, only 8 remain, including UP 4012 at Steamtown. The locomotive weighs 1,200,000 lbs. and still has a max. speed of 80 mph.

Big Boy in the early days of Steamtown at Scranton.

Union Pacific Big Boy 4012 poses alongside CN #47 a 4-6-4T Baltic Tank Engine at Steamtown.

While stopped on the #1 Main waiting for Amtrak I stepped out out of the cab and snapped this shot. This is looking West towards Crockett. This is actually an SD70M. Thanks SPW

The crown jewel of Steamtown's collection, the UP Big Boy.

The UP Big Boy basks in the morning sun in Scranton

Not the steam

UP Big Boy sits at Steamtown

UP Big Boy at the Steamtown entranceway, first one I've seen, and they are just massive.