Allegheny Steam Locomotive, 1941 Among the largest and most powerful steam locomotives ever built, it weighed 1.2 million pounds with its tender and could generate 7,500 horsepower. Just 11 years later, C&O began pulling these giants from service.

The largest and most powerful locomotive at the Henry Ford Museum of American Innovation is the 1941 Allegheny Steam Locomotive. Designed for the Chesapeake & Ohio Railway, this high-fidelity engineering giant is 125 feet long and weighs a staggering 1.2 million pounds (including its tender). It was built specifically to haul massive coal trains—often 160 cars long—over the steep grades of the Allegheny Mountains. The locomotive features a unique "2-6-6-6" wheel arrangement to support its massive weight and could generate an incredible 7,500 horsepower, making it one of the most powerful steam engines ever constructed. Because it was so large and heavy, it could only run on specific tracks that were strong enough to support its weight. Today, it stands as the centerpiece of the museum's "Driving America" exhibit, a massive steel monument to the pinnacle of steam technology before the industry shifted to more efficient diesel-electric engines in the early 1950s.