A 2-8-8-4 Yellowstone locomotive, manufactured by the Baldwin Locomotive Works, circa 1940.

Credit: Courtesy of the Railroad Museum of Pennsylvania Operated by the Pennsylvania Historical and Museum Commission

In the 1940s, Baldwin Locomotives manufactured eighteen "Yellowstone" locomotives for the Duluth, Missabe and Iron Range RR. Tipping the scales at 1,178,000 lbs they were the largest and heaviest steam locomotives ever produced in Pennsylvania.