The reference for locomotives and railcars


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Baltimore & Ohio class E-27
United States | 1905 | 409 produced
E-27b No. 2899 in front of two Mikados of the Q-1aa class in December 1942 at Chillicothe, Ohio
E-27b No. 2899 in front of two Mikados of the Q-1aa class in December 1942 at Chillicothe, Ohio
James Bowie / collection Taylor Rush

The largest class of Consolidations built for the Baltimore & Ohio was the E-27. The intended area of service were heavy freight trains on both flat and mountainous routes. In order to keep the strain on the locomotive and tracks low, a driver diameter was chosen that was larger than on previous consolidations and at the same time a long cylinder stroke of 30 inches with a comparatively small diameter.

205 of the original E-27 were built in 1905 and 1906 at the ALCO plants in Schenectady and Richmond. The E-27b only followed in 1909 and was largely the same. Changes only affected the Walschaert valve gear and two-inch larger wheels. After 84 E-27b had been built, 120 more followed, which had a larger number of thinner diameter tubes in the boiler and were given the same designation.

When being superheated, different variants were created, which were given different class names. The differences here lay in the superheater, the cylinder dimensions and the valve gear. A total of 116 E-27 were rebuilt into class L-2 0-8-0 switchers. The last E-27 were retired in 1959.

VariantE-27E-27b - 1909E-27b - 1910rebuilt E-27ca. da
Built1905-19061909-19101910from 1920
Axle config2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase25 ft 7 in
Fixed wheelbase16 ft 8 in
Total wheelbase59 ft 8 in
Service weight208,500 lbs220,370 lbs220,300 lbs226,550 lbs
Adhesive weight185,900 lbs198,650 lbs195,580 lbs203,550 lbs
Total weight352,000 lbs368,440 lbs368,370 lbs374,620 lbs
Axle load46,475 lbs49,663 lbs48,895 lbs53,900 lbs
Water capacity7,000 us gal7,500 us gal7,000 us gal
Fuel capacity30,000 lbs (coal)36,000 lbs (coal)
Power sourcesteam
Estimated power1,650 hp (1,230 kW)1,675 hp (1,249 kW)1,950 hp (1,454 kW)
Optimal speed25 mph26 mph24 mph
Starting effort42,168 lbf40,808 lbf50,934 lbf
Power Plant
Driver diameter60 in62 in
Boiler pressure205 psi215 psi
Expansion typesimple
Cylinderstwo, 22 x 30 intwo, 24 x 30 in
Grate area56.2 sq ft57.1 sq ft56.2 sq ft
Firebox area179.3 sq ft
Tube heating area2,629.7 sq ft2,594.7 sq ft2,668.7 sq ft2,213.7 sq ft
Evaporative heating area2,809 sq ft2,774 sq ft2,848 sq ft2,393 sq ft
Superheater area425 sq ft
Total heating area2,809 sq ft2,774 sq ft2,848 sq ft2,818 sq ft
Calculated Values
steam locomotive
last changed: 12/2023

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