More on 4014 Big Boy, the largest steam locomotive produced. They were retired in 1961 and there are many on display around the United States. The Union Pacific railroad finished a multiyear rebuild of unit 4014. Sadly the rebuild also retrofitted her to run on oil and not coal but it is nice to see one of these monsters roaming the rails again after half a century or so.
Also note that engine 844 a Northern class locomotive is also present.