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 11" 282mm curves.