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Page views since 2023-01-26: 12,262,790
Southern Railway (USA) class Ms-4
go back
United States | 1923
115 produced
Alabama Great Southern No. 6625 in 1939 at Birmingham, Alabama
Alabama Great Southern No. 6625 in 1939 at Birmingham, Alabama
H.I. Humphrey

The Ms-4 was a class of 115 Mikados that was used by the Southern as standard freight locomotive and as occasional replacement for passenger locomotives. It was basically an improved USRA Heavy Mikado with similar dimensions. The first batch, numbered 4800 to 4839, had been built in 1923 by ALCO-Richmond. Schenectady delivered 4840 to 4864 in 1924 and 4865 to 4884 in 1925. 4885 to 4914 followed from Baldwin in 1928.

The firebox surface included 49 square feet in a combustion chamber and 28 square feet in arch tubes. Their feed water heaters had come from Elesco, Worthington and Coffin. The valve gear of the ALCO locomotives was of the Baker type, while Baldwin used Walschaerts valve gear. The Cincinnati, New Orleans & Texas Pacific received 43 similar locomotives from Richmond and Baldwin and the Alabama Great Southern got eight more from Richmond. All were retired between 1952 and 1954.

General
Built1923-1928
ManufacturerALCO, Baldwin
Wheel arr.2-8-2 (Mikado) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase36 ft 11 in
Rigid wheelbase16 ft 9 in
Total wheelbase71 ft 8 in
Service weight326,000 lbs
Adhesive weight239,500 lbs
Total weight517,600 lbs
Axle load60,700 lbs
Water capacity10,000 us gal
Fuel capacity32,000 lbs (coal)
Boiler
Grate area70.3 sq ft
Firebox area305 sq ft
Tube heating area3,980 sq ft
Evaporative heating area4,285 sq ft
Superheater area993 sq ft
Total heating area5,278 sq ft
Power Plant
Driver diameter63 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 27 x 32 in
Power
Power sourcesteam
Estimated power3,300 hp (2,461 kW)
Starting effort62,949 lbf
Calculated Values
steam locomotive
freight
last changed: 03/2026
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