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Page views since 2023-01-26: 14,591,034
Atlanta & West Point class F
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United States | 1918
6 produced
No. 425 in July 1940 at Atlanta, Georgia
No. 425 in July 1940 at Atlanta, Georgia
Donald Hensley, Jr. collection

The Atlanta & West Point operated a total of six Mikados of different design, which were designated class F. The first two, numbered 400 and 401, were built in 1918 by Lima. They were of the Harriman Common Standard Mikado design and were built together with two for the Western Railway of Alabama. Three more were built by Lima between 1923 and 1925 which received the numbers 425 to 427. But these were copies of the USRA Light Mikado and again, the Western Railway of Alabama got four from the same batch.

No. 430, built by Baldwin in 1944, was an updated USRA Heavy Mikado copy. Together with another locomotive for the Western Railway of Alabama, they were among the last Mikados built for a US railroad. The total surface in the firebox was much bigger with 57 square feet in the combustion chamber, two thermic syphons of 40 square feet each and 14 square feet in arch tubes. 400 and 401 were retired in 1951 and the others followed between 1952 and 1954.

Variant400, 401425-427430
General
Built19181923-19251944
ManufacturerLimaBaldwin
Wheel arr.2-8-2 (Mikado) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase35 ft 2 in36 ft 11 in
Rigid wheelbase16 ft 6 in16 ft 9 in
Total wheelbase72 ft 3 in71 ft 4 1/2 in81 ft 6 1/2 in
Service weight283,000 lbs292,000 lbs333,800 lbs
Adhesive weight214,000 lbs225,600 lbs258,700 lbs
Total weight488,600 lbs473,700 lbs667,700 lbs
Axle load55,000 lbs56,400 lbs64,675 lbs
Water capacity11,000 us gal10,000 us gal18,000 us gal
Fuel capacity30,000 lbs (coal)32,000 lbs (coal)36,000 lbs (coal)
Boiler
Grate area70.4 sq ft66.7 sq ft70.3 sq ft
Firebox area235 sq ft280 sq ft376 sq ft
Tube heating area3,986 sq ft3,497 sq ft3,624 sq ft
Evaporative heating area4,221 sq ft3,777 sq ft4,000 sq ft
Superheater area865 sq ft882 sq ft1,276 sq ft
Total heating area5,086 sq ft4,659 sq ft5,276 sq ft
Variant400, 401425-427430
Power Plant
Driver diameter63 in
Boiler pressure180 psi200 psi
Expansion typesimple
Cylinderstwo, 27 x 30 intwo, 26 x 30 intwo, 27 x 32 in
Power
Power sourcesteam
Estimated power2,800 hp (2,088 kW)2,950 hp (2,200 kW)3,400 hp (2,535 kW)
Starting effort53,113 lbf54,724 lbf62,949 lbf
Calculated Values
steam locomotive
freight
last changed: 06/2026
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