Illinois Southern 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 312/311 (Locobase 16452)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 25, p. 13. See also Wayne Leeman, "Missouri and Illinois Rail Line Had Stormy Career From Start", St Louis Post-Dispatch (1955), archived on the MoPac Heritage website at [], last accessed 20 October 2019.

Works numbers were 24691, 24701 in September 1904.

Baldwin delivered five Moguls to the Southern Missouri Railroad in 1902 (Locobase 12617). Two years and merger later, the Illinois Southern, which now owned those five 2-6-0s, bought two more of the same design. Although the railroad ordered the pair on 28 July 1904 as road numbers 312-313, a 15 November 1904 change from the railroad changed them to 311-312.

Of particular mention was the insistence that the builder "give particular attention to getting even distribution of weight." Among the "special equipment" specified were Linstrom eccentrics, which were fastened to the axle with a U-bolt rather than set screws and Linstrom non-freezing suction pipe to convey feed water from tender to boiler..

Financial struggles besetting ill-starred John R Walsh, self-styled Chicago tycoon, and the sinking of the Ste Genevieve transfer boat with "about half the railroad" led to the railroad entering receivership for two years in 1918-1920, after which it was bought by the Missouri-Illinois. The Mike and Ike's main line's western end lay in Bismarck (south of St Louis) and ran northeast, crossed the Mississippi by car ferry between Thomure, Mo and Kellogg, Ill and continued on through Centralia to Salem, where it met the direct Baltimore & Ohio line to St Louis.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID16452
RailroadIllinois Southern
Number in Class2
Road Numbers312-313/311-312
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)19.92 / 6.07
Ratio of driving wheelbase to overall engine wheelbase 0.60
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)114,000 / 51,710
Engine Weight (lbs / kg)129,000 / 58,513
Tender Loaded Weight (lbs / kg)100,000 / 45,359
Total Engine and Tender Weight (lbs / kg)229,000 / 103,872
Tender Water Capacity (gals / ML)5000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)8 / 7
Minimum weight of rail (calculated) (lb/yd / kg/m)63 / 31.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)52 / 1321
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)20" x 24" / 508x610
Tractive Effort (lbs / kg)28,246 / 12812.19
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04
Heating Ability
Tubes (number - dia) (in / mm)259 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.25 / 3.43
Firebox Area (sq ft / m2)140.70 / 13.07
Grate Area (sq ft / m2)22.28 / 2.07
Evaporative Heating Surface (sq ft / m2)1654 / 153.66
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1654 / 153.66
Evaporative Heating Surface/Cylinder Volume189.46
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4010
Same as above plus superheater percentage4010
Same as above but substitute firebox area for grate area25,326
Power L14213
Power MT244.42

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Wes Barris