In 1923, the Great Northern Railway received 28 Class P-2 "Mountains" from the Baldwin Locomotive Works. Numbered 2500 through 2527, these locomotives had 29 x 28 cylinders, 73-inch drivers, 200 psi boiler pressure, a tractive effort of 54,823 pounds, and weighed 365,600 pounds each. Later, the boiler pressure was raised to 210 psi, increasing the tractive effort to 57,580 pounds. The Class P-2 "Mountains" performed excellent passenger service before being replaced by the S-2 Northerns in Empire Builder service. They were then used in freight service and were retired in 1955. Their specifications included a 4-8-2 wheel arrangement, a length of 102 feet 1 7/8 inches, weight on drivers of 242,000 pounds, locomotive and tender weight of 617,000 pounds, and tender capacities of 15,000 gallons of water and 5,660 gallons of fuel oil.