Chicago, St Paul, Minneapolis & Omaha 2-10-2 "Santafe" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class J-1 (Locobase 14578)

Data from DeGolyer, Volume 55, pp. 65+. Works numbers were 45976-45977 in July 1917.

Very few Santa Fe-arrangement locomotives were delivered with saturated boilers. Their direct heating surface areas included 79 sq ft (7.3 sq m) in the combustion chamber and 28 sq ft (2.6 sq m) of arch tubes. Fourteen-inch (381 mm) piston valves fed the cylinders

These two had a specific mission to serve as helpers on trains climbing out of the St Croix Valley in western Wisconsin.

At some point, the J-1s were superheated; see Locobase 14578.

Class J-1-superheated (Locobase 14579)

Data from C&NW 10 -1 1952 locomotive diagrams supplied by Allen Stanley in May 2005.

Delivered in 1917 with saturated boilers (Locobase 14578), these Santa Fes were later superheated.

After 1944, the pair bore the Chicago & North Western herald. Both engines lost their leading axles and operated as heavy 0-10-2 switchers after conversions in January (492) and July (491) 1944.

492 was retired in 1950 and 491 left in 1953.

Specifications by Steve Llanso of Sweat House Media
Locobase ID14578 14579
RailroadChicago, St Paul, Minneapolis & Omaha (C&NW)Chicago, St Paul, Minneapolis & Omaha (C&NW)
Number in Class22
Road Numbers491-492491-492
Number Built22
Valve GearBakerBaker
Locomotive Length and Weight
Driver Wheelbase21'21'
Engine Wheelbase38.92'38.92'
Ratio of driving wheelbase to overall engine wheebase 0.54 0.54
Overall Wheelbase (engine & tender)71.58'71.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers265000 lbs266000 lbs
Engine Weight331000 lbs331000 lbs
Tender Light Weight165500 lbs165500 lbs
Total Engine and Tender Weight496500 lbs496500 lbs
Tender Water Capacity8725 gals8275 gals
Tender Fuel Capacity (oil/coal)13 tons13 tons
Minimum weight of rail (calculated)88 lb/yard89 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"57"
Boiler Pressure185 psi205 psi
Cylinders (dia x stroke)27" x 32"27" x 32"
Tractive Effort64357 lbs71314 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.12 3.73
Heating Ability
Firebox Area319 sq. ft319 sq. ft
Grate Area66.60 sq. ft66.50 sq. ft
Evaporative Heating Surface5685 sq. ft4233 sq. ft
Superheating Surface1052 sq. ft
Combined Heating Surface5685 sq. ft5285 sq. ft
Evaporative Heating Surface/Cylinder Volume268.09199.62
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1232113633
Same as above plus superheater percentage1232116359
Same as above but substitute firebox area for grate area5901578474
Power L1603414048
Power MT250.99582.15


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