Built for Union Pacific Railroad as one of 25 Big Boys ordered by the UP to haul heavy freight across the Continental Divide. Big Boys are famous as among the most powerful steam locomotives ever built. Weighs 1,200,000 pounds. Front set of drive wheels are articulated to move freely around sharp curves. Four cylinders, tractive effort equals four lesser locomotives, built to achieve 80 mph speeds. One of eight remaining of this classification.
|Series||4000 / Big Boy|
|Diameter driving wheels||1727 mm|
|Weight full||567 ton|
|Overheated area||190 m2|
|Grate area||14 m2|
|Cilinders||4: 603x813 mm|
|Fuel capacity||coal: 25,4 ton|
|Water capacity||95 m3|
|1941||Build for||Union Pacific Railroad||4000 / Big Boy||/ 4012|
|1962||Sold to||Steamtown National Historic Site||4000 / Big Boy||/ 4012|
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