The reference for locomotives and railcars
Santa Fé class 5011
United States | 1944 | 25 produced
No. 5027
No. 5027
Harold K. Vollrath

Although the Santa Fe was already in the midst of converting freight traffic from steam to diesel during World War II, it procured 25 more steam locomotives in 2-10-4 wheel arrangement in 1944. They were all delivered with oil firing, got the numbers 5011 to 5035 and were also called “War Babies”. Despite a smaller firebox, the performance of the boiler could be kept almost the same. By distributing the weight differently, it was possible to increase the adhesive weight by four tons while the locomotive weight had fallen by four tons. Significantly heavier tenders with eight axles were used again, which held 24,500 gallons of water and 7,000 gallons of oil. This lifted the combined weight of the locomotive and tender to just over the magic one million pound mark.

As late as 1944, measurements of the performance of the first locomotive in the series were made, which led to sensational values. In one test, a five-mile grade of a constant 0.8 percent was climbed by a train of 94 cars weighing about 5,440 tons. From an initial speed of 56 mph, there was still 18 mph left at the end of the incline, where most other locomotives would have come to a standstill long ago. With these performances, the locomotives can certainly be described as the pinnacle of the single-frame steam locomotives, as they were only surpassed by locomotives with split running gear and more coupled axles overall. They, too, made their last commercial journeys in 1957 and stood in reserve for another two years before almost all of them were scrapped. Four examples are still preserved today, none of which are operational.

Axle config2-10-4 (Texas) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length123 ft 5 in
Wheelbase50 ft 3 in
Fixed wheelbase26 ft 2 in
Total wheelbase109 ft 8 in
Service weight536,000 lbs
Adhesive weight380,300 lbs
Total weight1,000,700 lbs
Axle load77,400 lbs
Water capacity24,500 us gal
Fuel capacity7,170 us gal (oil)
Power sourcesteam
Estimated power6,050 hp (4,511 kW)
Optimal speed35 mph
Top speed70 mph
Starting effort108,961 lbf
Power Plant
Driver diameter74 in
Boiler pressure310 psi
Expansion typesimple
Cylinderstwo, 30 x 34 in
Grate area121.5 sq ft
Firebox area494 sq ft
Tube heating area5,443 sq ft
Evaporative heating area5,937 sq ft
Superheater area2,589 sq ft
Total heating area8,526 sq ft
Calculated Values
steam locomotive
last changed: 03/2022

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