Utah Railway 2-8-8-0 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 200 (Locobase 9496)

Data from "Mallet Locomotives for the Utah Railway," Railway and Locomotive Engineering, February 1919, p.39. See also DeGolyer, Volume 56, pp. 249+. Works numbers were 48221-48222 in April 1918 and 48901 in June.

Virtually identical to the B&O ELs shown in Locobase 439, this trio went to the United States Smelting company for them to operate on the UR. One small difference was the UR engines' use of 1" smaller diameter drivers to conquer grades of up to 2.4%. The Mallet layout contributed to an ability to negotiate 20-deg curves in sidings and 9-deg curves on the main line.

All four cylinders were supplied through 15" (381 mm) piston valves. Firebox heating surface area included 43 sq ft (4.0 sq m) in four arch tubes and 118 sq ft (10.96 sq m) from the combustion chamber.

The article noted another feature of use in the Utah Railway's winding surroundings: "The Baldwin design of flexible articulated frame connection is used. With this construction, the front and rear frames can move relatively to each other in a vertical plane, without causing binding at the hinge pin. The value of this feature is specially noticeable in a Mallet locomotive with long wheelbase, when passing over uneven tracks or sudden changes in grade."

The design proved successful enough to endure into the 1950s with two of the engines leaving service in 1954 and the third (201) as late as March 1957.

Specifications by Steve Llanso of Sweat House Media
Locobase ID9496
RailroadUtah Railway
Number in Class3
Road Numbers200-202
Number Built3
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase15.50'
Engine Wheelbase50.33'
Ratio of driving wheelbase to overall engine wheebase 0.31
Overall Wheelbase (engine & tender)88.50'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers452300 lbs
Engine Weight476300 lbs
Tender Light Weight215700 lbs
Total Engine and Tender Weight692000 lbs
Tender Water Capacity12000 gals
Tender Fuel Capacity (oil/coal)20 tons
Minimum weight of rail (calculated)94 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"
Boiler Pressure210 psi
High Pressure Cylinders (dia x stroke)26" x 32"
Low Pressure Cylinders (dia x stroke)41" x 32" (2)
Tractive Effort96627 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.68
Heating Ability
Firebox Area392 sq. ft
Grate Area88.20 sq. ft
Evaporative Heating Surface5835 sq. ft
Superheating Surface1446 sq. ft
Combined Heating Surface7281 sq. ft
Evaporative Heating Surface/Cylinder Volume296.73
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation18522
Same as above plus superheater percentage22226
Same as above but substitute firebox area for grate area98784
Power L18490
Power MT331.06

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