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Texas & Pacific class E-1
United States | 1906 | 2 produced
Railway and Locomotive Engineering, August 1906

In 1906, the Texas & Pacific manufactured two examples of the Class E-1 in their own works in Marshall, Texas, which would remain their only Atlantic locomotives. The boiler was relatively small compared to the cylinder volume, but it operated at a relatively high pressure of 220 psi for the time. A special feature of the chassis was that the compensating levers also included the trailing axle in addition to the coupled axles, which is why this was also loaded with a high load of 58,000 pounds. This resulted in a tail-heaviness that led to unsatisfactory running characteristics. In addition, the tractive effort at this time was no longer quite sufficient for modern steel passenger cars.

For these reasons, the two locomotives underwent a complete conversion as early as 1917. To increase traction, the coupled wheels were reduced from 79 to 75 inches. Boiler pressure was reduced to 185 psi, but this was offset by increasing the cylinder diameter from 20 to 22 inches. The cylinders were now supplied by piston valves instead of slide valves. The boiler now contained a relatively large superheater and was oil-fired. The two locomotives survived in this form for a little over ten years until they were retired in December 1928 and January 1929.

Variantas builtrebuilt E-1s
ManufacturerTexas & Pacific
Axle config4-4-2 (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase27 ft 7 in
Fixed wheelbase7 ft
Total wheelbase56 ft 10 1/2 in
Service weight204,000 lbs214,000 lbs
Adhesive weight116,000 lbs124,000 lbs
Total weight336,000 lbs329,000 lbs
Axle load58,000 lbs62,000 lbs
Water capacity6,500 us gal
Fuel capacity20,000 lbs (coal)3,000 us gal (oil)
Power sourcesteam
Estimated power1,600 hp (1,193 kW)1,700 hp (1,268 kW)
Optimal speed38 mph
Starting effort26,511 lbf28,414 lbf
Power Plant
Driver diameter79 in75 in
Boiler pressure220 psi185 psi
Expansion typesimple
Cylinderstwo, 20 x 28 intwo, 22 x 28 in
Grate area45.3 sq ft45 sq ft
Firebox area160 sq ft180 sq ft
Tube heating area2,731 sq ft2,290 sq ft
Evaporative heating area2,891 sq ft2,470 sq ft
Superheater area525 sq ft
Total heating area2,891 sq ft2,995 sq ft
Calculated Values
steam locomotive
last changed: 09/2022

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