The Great Northern P-2 was a class of 28 4-8-2 "Mountain" type steam locomotives built by the Baldwin Locomotive Works in 1923 and operated by the Great Northern Railway until the late 1950s.

They were built to speed up passenger trains on the mainline and have replaced the earlier P-1 Class of "Mountains" of 1914, as they were deemed too slow for passenger service.

[1] In service, they were limited to 50 mph, but managed up to 4,800 miles a month and were rated at 10-12 heavyweight passenger cars up the 1.8% Walton Hill at 18 mph.

Helper service is provided up the 1.65% grade outside of the St. Paul Union Depot if trains consisted of 10 or more cars.

While their performance in passenger service was excellent, they were replaced by the S-2 Class of Northerns in Empire Builder service, regulating them to other passenger trains and freight trains.