Union Pacific #838 (Freight Version; Flat Black, Graphite) Class FEF-3 4-8-4 - Standard DCDetails: The most recognizable and famous UP Steam Locomotive, the FEF (Four Eight Four) is recreated in this detailed model. Features include a number of revolutionary design innovations, including a coreless motor with dual flywheels for silky smooth side rod operation at any speed (even a slow crawl), inside bearing wheels (where appropriate), and a special articulated undercarriage on the unique, 14 wheel Tender to allow the locomotive to navigate