Kato 126-0403 - Union Pacific FEF-3 Greyhound #8444 Steam Locomotive
The Union Pacific FEF (Four Eight Four), along with the GS-4 is easily one of the most recognizable US steam prototypes still in operation today. The FEF-3 series of steam locomotives was delivered in 1944 and were the last, and some of the largest, steam locomotives delivered for use by the Union Pacific. Operated solely by the Union Pacific, the FEF's (sometimes referred to as "Northerns", due to the NP's being the first to build steam locomotives with the 4-8-4 wheel arrangement) were intended primarily to be passenger locomotives but the UP's large fleet of available diesels meant that the FEF's were put to work in secondary passenger and fast freight service.
Today, FEF-3 #844 (at some times during history also known as #8444 to avoid numbering conflictions with a diesel loco) survives to pull excursion trains as a publicity locomotive for the Union Pacific, and is one the UP's oldest operating locmotives.