The LNER originally planned a locomotive with a 2-10-0 wheel arrangement as a more powerful successor to the GNR Class O2. Ultimately, the two class P1 locomotives were built in 1925 and had the wheel arrangement 2-8-2. To increase tractive power, they had three cylinders and an additional booster on the trailing axle. The tractive power was sufficient for trains with 100 coal cars, but due to their length they caused problems in the operational process and meant that there was no series production. Because the boosters consumed too much coal and steam was leaking into the cab, they were removed in 1937 and 1938. In 1942 both locomotives were rebuilt to class P1/2, with smaller cylinders and higher boiler pressure. Immediately after the end of the Second World War, they were scrapped because the decline in freight traffic meant that there couldn't be found another area of use.