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.
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|
|Railroad||Chicago, St Paul, Minneapolis & Omaha (C&NW)||Chicago, St Paul, Minneapolis & Omaha (C&NW)|
|Number in Class||2||2|
|Locomotive Length and Weight|
|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 Drivers||265000 lbs||266000 lbs|
|Engine Weight||331000 lbs||331000 lbs|
|Tender Light Weight||165500 lbs||165500 lbs|
|Total Engine and Tender Weight||496500 lbs||496500 lbs|
|Tender Water Capacity||8725 gals||8275 gals|
|Tender Fuel Capacity (oil/coal)||13 tons||13 tons|
|Minimum weight of rail (calculated)||88 lb/yard||89 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||185 psi||205 psi|
|Cylinders (dia x stroke)||27" x 32"||27" x 32"|
|Tractive Effort||64357 lbs||71314 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.12||3.73|
|Firebox Area||319 sq. ft||319 sq. ft|
|Grate Area||66.60 sq. ft||66.50 sq. ft|
|Evaporative Heating Surface||5685 sq. ft||4233 sq. ft|
|Superheating Surface||1052 sq. ft|
|Combined Heating Surface||5685 sq. ft||5285 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||268.09||199.62|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||12321||13633|
|Same as above plus superheater percentage||12321||16359|
|Same as above but substitute firebox area for grate area||59015||78474|