Chesapeake and Ohio's Allegheny.
its an articulated 2-6-6-6
125-ft long, 11-ft 2-in wide, 16-ft 5 ½-in tall and weighs approximately 771,000-lbs. It could pull 160 coal cars, each with a 60-ton load, and if only pulling passenger cars, could run at 60 mph. 1601’s original price was $230,663. built by Lima in Lima Ohio in 1941.
while not as 'big' as the Union Pacific's Big Boy locomotives but more powerful in terms of pulling capacity because of tractive effort (weight on the driving wheels and other math, i dont understand)
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