The reference for locomotives and railcars
Santa Fé No. 5000
United States | 1930 | only one produced
Baldwin factory photo
Baldwin factory photo

As early as 1919, the Santa Fe converted a class 3800 2-10-2 locomotive into a 2-10-4, creating the world's first locomotive with this wheel arrangement. This was done by exchanging the rear carrying axle for a bogie, while slightly increasing the boiler's heating surface. However, since the firebox was not enlarged, the gains in performance were limited and it remained a one-off. However, since the Texas & Pacific had built the first 2-10-4 in series from 1925, this type was called “Texas”. It was not until 1930 that the Santa Fé built engine number 5000 directly as 2-10-4, which soon became known as “Madame Queen”.

The boiler was designed to be significantly more powerful with a grate area of more than 120 square feet, three thermic syphons and a total heating surface increased by 34%. This made the locomotive significantly heavier and reached a maximum axle load of more than 76,000 pounds. The tender was also very large with a total weight of 375,000 pounds, which was carried on six axles. It held 20,000 gallons of water and 46,000 pounds of coal. Compared to its predecessor, it could tow 15% more weight in 9% less time with 17% less coal per ton-mile. It formed the basis for the classes 5001 and 5011 and remained in service just as long as these, i.e. until 1957.

Axle config2-10-4 (Texas) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase47 ft 7 in
Fixed wheelbase24 ft 6 in
Total wheelbase99 ft 7 in
Service weight502,600 lbs
Adhesive weight372,000 lbs
Total weight877,600 lbs
Axle load76,570 lbs
Water capacity20,000 us gal
Fuel capacity46,000 lbs (coal)
Power sourcesteam
Estimated power6,050 hp (4,511 kW)
Optimal speed34 mph
Starting effort113,087 lbf
Power Plant
Driver diameter69 in
Boiler pressure300 psi
Expansion typesimple
Cylinderstwo, 30 x 34 in
Grate area121.8 sq ft
Firebox area598 sq ft
Tube heating area5,516 sq ft
Evaporative heating area6,114 sq ft
Superheater area2,741 sq ft
Total heating area8,855 sq ft
Calculated Values
steam locomotive
last changed: 03/2022

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