| Big power for dragging long strings of coal cars, that's what this 1917 Alco "Mallet Mogul" type locomtive was built to handle for the Hocking Valley RR. Specifics - class H-3, 56.25" drivers, impressive 22 psi boiler pressure, 22x32" high pressure cylinders, two sets of 35x32" low pressure cylinders, 367,000 lb engine weight, 73,814 lb tractive effort, Arthur B. Johnson photo |