The reference for locomotives and railcars
Central Pacific “El Gobernador”
United States | 1884 | only one produced
Henry B. Comstock, „The Iron Horse, An Illustrated History”

In search of an even more powerful locomotive than the GE class with the 4-8-0 wheel arrangement, A.J. Stevens expanded this with another driving axle. The only locomotive built with this wheel arrangement was christened “El Gobernator”.

In order to still be able to run through all curves, the last driving axle was mounted so that it could be moved sideways and the third and fourth were designed without wheel flanges. The cylinders were only 21 inches in diameter, but had an extremely long stroke of 36 inches to achieve the power required. The valve gear was of a design Stevens had developed himself.

Although the locomotive was presented to the public, no use was found for this size class at the time. It also turned out that the boiler did not produce enough steam for the large cylinders. It was scrapped about ten years after completion.

Axle config4-10-0 (Mastodon) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase28 ft 11 in
Fixed wheelbase19 ft 7 in
Total wheelbase52 ft 8 in
Service weight154,000 lbs
Adhesive weight130,000 lbs
Total weight217,000 lbs
Axle load26,750 lbs
Water capacity3,000 us gal
Fuel capacity10,000 lbs (coal)
Power sourcesteam
Estimated power675 hp (503 kW)
Optimal speed13 mph
Starting effort31,961 lbf
Power Plant
Driver diameter57 in
Boiler pressure135 psi
Expansion typesimple
Cylinderstwo, 21 x 36 in
Grate area29.8 sq ft
Firebox area197 sq ft
Tube heating area1,258 sq ft
Evaporative heating area1,455 sq ft
Total heating area1,455 sq ft
Calculated Values
steam locomotive
A.J. Stevens
last changed: 03/2023

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