With this beautiful Heidi

Model Number: 5213

The Trainz SKU for this item is P11981578

Model Number: 949-11186

MTH 30-1623-1 O Union Pacific Imperial 4-6-6-4 Steam Locomotive w/P-S 3.0 #3980 LastUpdated_20262904095036 With this beautiful HeidiThis is a MTH 30 1623 1 O Union Pacific Imperial 4 6 6 4 w Proto Sound 3. 0, TT Gray Yellow #3980. The first Challengers were conceived in 1936 as fast freight engines to replace the Union Pacific's fleet of three cylinder 4 12 2 locomotives. With an extra center cylinder for added power and a top speed of 45 mph, the 4 12 2s had been successful freight engines when built in 1926. But a decade later they were considered slow and difficult to maintain.