The reference for locomotives and railcars


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Southern Railway (USA) classes K and Ks
United States | 1903 | 585 produced
No. 849
No. 849
collection Rich Driver

The class K designated a class of standard Consolidations of the Southern, with over 500 built beginning in 1903. The first 128 locomotives had a boiler with 437 smoke tubes, the later ones only had 403 tubes. In addition to the Southern, the subsidiaries also received a three-digit number of the second version. From 1921, a total of 393 units were equipped with a superheater, the valve chest was also replaced and the class designation was changed to “Ks”. Depending on whether the individual locomotives had been rebuilt, they were taken out of service towards the end of the 1930s or even survived the early 1950s.

Variantfirst variantsecond variantKs - 22½ inches
Built1903-19041905-1906from 1921
ManufacturerALCO, BaldwinBaldwinSouthern
Axle config2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase24 ft 3 1/2 in
Fixed wheelbase16 ft
Total wheelbase54 ft 11 1/2 in56 ft 9 in
Service weight199,875 lbs199,910 lbs213,000 lbs
Adhesive weight176,750 lbs180,610 lbs189,000 lbs
Total weight319,875 lbs346,910 lbs360,000 lbs
Axle load44,188 lbs45,153 lbs46,945 lbs
Water capacity8,000 us gal7,500 us gal
Fuel capacity25,000 lbs (coal)24,000 lbs (coal)
Power sourcesteam
Estimated power1,500 hp (1,119 kW)1,550 hp (1,156 kW)1,700 hp (1,268 kW)
Optimal speed22 mph23 mph22 mph
Starting effort44,079 lbf43,305 lbf48,693 lbf
Power Plant
Driver diameter56 in57 in
Boiler pressure200 psi215 psi
Expansion typesimple
Cylinderstwo, 22 x 30 intwo, 22 1/2 x 30 in
Grate area53 sq ft54 sq ft53.5 sq ft
Firebox area143 sq ft237 sq ft232 sq ft
Tube heating area3,375 sq ft3,065 sq ft2,094 sq ft
Evaporative heating area3,518 sq ft3,302 sq ft2,326 sq ft
Superheater area510 sq ft
Total heating area3,518 sq ft3,302 sq ft2,836 sq ft
Calculated Values
steam locomotive
last changed: 07/2023

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