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Southern Railway (USA) class Ms
originally class K
United States | 1911
135 produced
No. 4501 in February 1972 in Norris Yard at Birmingham, Alabama
No. 4501 in February 1972 in Norris Yard at Birmingham, Alabama

The first Mikados that the Southern Railway procured were initially called class K and later renamed Ms. Between 1911 and 1914, a total of 135 units were delivered directly to the Southern by Baldwin and ALCO-Richmond. Together with the subsidiaries, the total number reached over 180, even if some locomotives there had differences.

The fireboxes of the locomotives were prepared directly by the manufacturers to accommodate arch tubes, but these were only installed later. Some were equipped with tractor tenders specifically for Saluda, the seven most successful of which were designated the Ms-2 class. The number 4501, which was used for special trips from 1966, is still operational today at the Tennessee Valley Railroad Museum.

General
Built1911-1914
ManufacturerBaldwin, ALCO
Axle config2-8-2 (Mikado) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase34 ft 9 in
Rigid wheelbase16 ft 6 in
Total wheelbase67 ft 0 1/2 in
Service weight272,940 lbs
Adhesive weight215,700 lbs
Total weight425,940 lbs
Axle load54,940 lbs
Water capacity24,000 us gal
Fuel capacity8,000 lbs (coal)
Boiler
Grate area53.3 sq ft
Firebox area212 sq ft
Tube heating area3,019 sq ft
Evaporative heating area3,231 sq ft
Superheater area699 sq ft
Total heating area3,930 sq ft
Power Plant
Driver diameter63 in
Boiler pressure175 psi
Expansion typesimple
Cylinderstwo, 27 x 30 in
Power
Power sourcesteam
Estimated power2,200 hp (1,641 kW)
Optimal speed27 mph
Starting effort51,637 lbf
Calculated Values
steam locomotive
freight
last changed: 02/2024
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