Class FEF-3 4-8-4 - LokSound and DCC -- Union Pacific #8444 (Greyhound 2-Tone Gray)Details: Kato N 126 0403 FEF 3 Class 4 8 4 Steam Locomotive Union Pacific 'Greyhound 2 Tone Gray Version' UP #8444 The Union Pacific FEF Four Eight Four, 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,