The massive Union Pacific Big Boy is the fastest and heaviest single-expansion steam locomotive ever built. UP Vice President Otto Jabelman's Department of Research and Mechanical Standards solved the need for doubleheading, helpers, and splitting long freights.

Union Pacific's twenty-five 4-8-8-4s have been turning heads and leaving lasting impressions since the day they first rolled out of the erecting shop. For all that has been said of their size, the Big Boys were just as impressive for their performance.

Available for the first time from Lionel with an oil tender, our Big Boy is a faithful rendition of the 4014 as it can be seen today. We've also added 4005 as it looked during its brief conversion to oil burning in 1945-46 and a fantastic "what if" Greyhound version inspired by …

Union Pacific VISION Big Boy #4019 Big Boy - the locomotive needs no further introduction. Union Pacific's twenty-five 4-8-8-4s have been turning heads and leaving lasting impressions since the day they first rolled out of the erecting shop.

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The ultimate articulated locomotive, the Union Pacific Big Boy, joins the semi-scale LionMaster roster. An imposing presence on any layout, the Lionel LionMaster Union Pacific Big Boy measures 29" versus the 25 1/4" length of other manufacturer's semi-scale "Little" Boys, and can still easily negotiate O-31 curves.

The Lionel Union Pacific Big Boy premieres the introduction of the Legacy System - the next generation of TrainMaster Command Control. Big Boy #4004, built in 1941, appears with the prototypical pilot-mounted air brake radiators and two from 1944 - #4023 and #4024 - feature accurate pilots as well.

The Big Boy has been reproduced in every conceivable scale and way, including Lionel. This newest release of Lionel VISION Big Boys includes even more new features and is sure to be the star of your locomotive roster.