The Rivarossi R5470 Steam Locomotive Union Pacific #843 Bonus 4 Rivarossi Cars is a pre-built model in HO scale designed for enthusiasts aged 17 years and up. This ready-to-go steam locomotive comes with four additional cars and is powered by DC, using an analog control system. The detailed plastic model features the Union Pacific Railroad corporate roadname and operates on a two-rail system, perfect for collectors and model railroad hobbyists interested in transportation-themed scenes. Tested and working The tender has a wheel that keeps falling out I do not want try to fix I am not that familiar with fixing trains and don’t want to make it worst.