Athearn #30106 4-8-8-4 Big Boy UP #4014/Excursion
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SURVIVING 4-8-8-4 BIG BOY PRESERVATION INFO 4004 Holliday Park 4005 Forney Transportation Museum 4006 Museum of Transportation 4012 Steamtown National Historic Site 4017 National Railroad Museum 4018 Museum of the American Railroad 4023 Kenefick Park PRESERVATION VERSION FEATURES As delivered from ALCO in service 1940s era Coal Tender Twenty-five Big Boys were built exclusively for Union Pacific Railroad the first of which was delivered in 1941. The locomotives were 132 feet long and weighed 1.2 million pounds. Because of their great length the frames of the Big Boys were “hinged” or articulated to allow them to negotiate curves. They had a 4-8-8-4 wheel arrangement which meant they had four wheels on the leading set of “pilot” wheels which guided the engine eight drivers another set of eight drivers and four wheels following which supported the rear of the locomotive. The massive engines normally operated between Ogden Utah and Cheyenne Wyo. There are seven Big Boys on public display in various cities around the country. They can be found in St. Louis Missouri Dallas Texas Omaha Nebraska Denver Colorado Scranton Pennsylvania Green Bay Wisconsin and Cheyenne Wyoming. Source Union Pacific Railroad WARTIME ERA VERSION FEATURES As delivered from ALCO in service 1940s era Coal Tender LOCOMOTIVE FEATURES Fully-assembled and ready-to-run DCC-ready features Quick Plug™ plug-and-play technology Scaled from prototype resources including drawings field measurements photographs and more Accurately-painted and –printed paint schemes Full cab interior with boiler backhead with printed gauges Individually applied piping valves generators etc. Operating eccentric cranks on both sides operating in correct direction Headlights and indicator number boxes (number boards) with directional light change Five pole skewed armature motor with flywheel for smooth operation Pivoting front and rear engines for negotiating 11” radius curves - 15” radius recommended See-through running boards See through cab windows McHenry scale knuckle couplers LED Lighting for realistic appearance Heavy die-cast frame for greater traction and more pulling power Packaging securely holds for the model for safe storage Union Pacific wanted something that could make the same speeds as the Challengers but could carry the entire 4290-ton train over the Wahsatch Mountains without a helper. The easiest solution was to scale up the successful Challenger design by adding another pair of drivers to each half of the locomotive thus making a 4-8-8-4. In 1941 UP placed an order for twenty 4-8-8-4’s numbered 4000 through 4019 with the American Locomotive Works. Each engine cost $265174. According to legend an unidentified machinist at the ALCO plant is responsible for the name “Big Boy” having scrawled the name in chalk on a partially completed locomotive. The Big Boys were exactly what the railroad wanted. They were coal burners with 68-inch drivers 135375 pounds of tractive effort and 6000 horsepower. They started service on the line from Ogden to Green River Wyoming and their operating range soon increased to cover the line all the way to Cheyenne. Traffic during WWII resulted in five more Big Boys numbered 4020 through 4024 being built in 1944. These versions were slightly heavier than the original order due to wartime materials restrictions.Despite the influx of diesel locomotives following WWII the Big Boys and Challengers remained the prime power on the Overland Route. They also saw service as helpers leading gas turbines and diesels over Sherman Hill. They remained active through the 1950’s and weren’t retired until the early 1960’s. By then the first twenty units had been run well over one million miles.
|New Arrivals||Apr 18, 2021|
|Train Category||Steam Locomotive|