The Wabash intended to use these "Mountains" for dual service, but because a similar number of "Northerns" arrived at the same time they were used mostly in freight service.
There are no surviving Wabash "Mountains". Nineteen were scrapped in 1953 and the remaining six went to the scrapper in 1955.
Firebox heating surface included 26 sq ft (2.4 sq m) in three arch tubes, 81.5 sq ft (7.6 sq m) of thermic syphons, and 87 sq ft (8.1 sq m) in the combustion chamber. The Worthington Type 5-S feedwater heater was located on the left side. 12" (305 mm) piston valves supplied steam to the cylinders; maximum valve travel reached 8" (203 mm).
Five of the small tubes were removed in the late 1930s-early 1940s, reducing the heating surface area by 59 sq ft (5.5 sq m) to 4, 561 sq ft (423.75 sq m). The road also inched up the boiler pressure, changing the setting to 245 psi (16.9 bar) and thus raising the nominal tractive effort to 69,400 lb (31,749 kg/308.7 kN). By that time, tender coal capacity had grown to 23 tons (while water capacity remained unchanged). The larger tender weight 131,000 lb (59,421 kg) empty and 302,000 lb (136,985 kg) loaded.
Intended for freights between Montpelier, Ohio and Decatur, Illinois).
Drury (1993) notes the strong similarities between these Mountains and the Northerns (Locobase 285) delivered by the same builder to the same railroad at the same time for the same service (freights between Montpelier, Ohio and Decatur, Illinois) and adds: "The question 'Why not 50 of one type?' remains unanswered." An article in Railway Age 14 February 1931 doesn't answer the question, certainly, saying only that the chief difference between the two was the larger grate in a longer, wider firebox.
See Locobase 285 for a discussion of other changes meant to maintain the balance of direct heating surface area and evaporative heating surface area.
Like most Wabash steam, these engines were retired in the mid-1950s
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Number in Class||25|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||18.25 / 5.56|
|Engine Wheelbase (ft / m)||41.92 / 12.78|
|Ratio of driving wheelbase to overall engine wheebase||0.44|
|Overall Wheelbase (engine & tender) (ft / m)||83.83 / 25.55|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)||67,900 / 30,799|
|Weight on Drivers (lbs / kg)||270,400 / 122,652|
|Engine Weight (lbs / kg)||406,400 / 184,340|
|Tender Loaded Weight (lbs / kg)||281,000 / 136,985|
|Total Engine and Tender Weight (lbs / kg)||687,400 / 321,325|
|Tender Water Capacity (gals / ML)||15,000 / 56.82|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||18 / 16.40|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||113 / 56.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||70 / 1778|
|Boiler Pressure (psi / kPa)||235 / 16.20|
|High Pressure Cylinders (dia x stroke) (in / mm)||27" x 32" / 686x813|
|Tractive Effort (lbs / kg)||66,568 / 30194.77|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.06|
|Firebox Area (sq ft / m2)||441 / 40.97|
|Grate Area (sq ft / m2)||84.20 / 7.82|
|Evaporative Heating Surface (sq ft / m2)||4620 / 429.21|
|Superheating Surface (sq ft / m2)||2004 / 186.18|
|Combined Heating Surface (sq ft / m2)||6624 / 615.39|
|Evaporative Heating Surface/Cylinder Volume||217.87|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||19,787|
|Same as above plus superheater percentage||25,723|
|Same as above but substitute firebox area for grate area||134,726|