The reference for locomotives and railcars


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London & North Eastern class P1
Great Britain | 1925 | 2 produced
P1/2 No. 2394
P1/2 No. 2394
Cecil J. Allen, „The Steel Highway” (1928)

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.

VariantP1/1 with boosterP1/2
Built19251942, 1943
Axle config2-8-2 (Mikado) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase36 ft 2 in
Fixed wheelbase18 ft 6 in
Service weight223,888 lbs
Adhesive weight160,048 lbs
Total weight339,248 lbs
Axle load41,216 lbs
Water capacity5,644 us gal
Fuel capacity15,680 lbs (coal)
Power sourcesteam
Estimated power1,600 hp (1,193 kW)2,000 hp (1,491 kW)
Optimal speed26 mph30 mph
Starting effort38,497 lbf42,464 lbf
Booster9,500 lbf
Power Plant
Driver diameter62 in
Boiler pressure180 psi220 psi
Expansion typesimple
Cylindersthree, center: 20 x 26 in
outside: 10 x 12 in
three, 19 x 26 in
Grate area41.3 sq ft
Firebox area215 sq ft
Tube heating area2,715 sq ft
Evaporative heating area2,930 sq ft
Superheater area525 sq ft
Total heating area3,455 sq ft
Calculated Values
steam locomotive
last changed: 10/2023

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