Illinois Southern 2-8-2 "Mikado" Locomotives in the USA

Ths Missouri Illinois was owned by Mopac and operated as a subsidiary railroad until it was merged into the Missouri Pacific in 1978.

Class Details by Steve Llanso of Sweat House Media

Class 501 (Locobase 14116)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 43, p. 196. Works numbers were 38678-38679 in November 1912.

The Illinois Southern was a bridge line that was formed in 1910 to consolidate the bankrupt Southern Illinois and the Southern Missouri. In 1920, the Missouri-Illinois was formed through the reorganization of the SI. The two Mikados in this entry retained their numbers under the new ownership.

501 had the shorter life and suffered a more violent end when its boiler exploded in 1930. 502 was later sold to the Missouri Pacific as their 1282 and operated until May 1952.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID14116
RailroadIllinois Southern
Number in Class2
Road Numbers501-502
Number Built2
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)15.33 / 4.67
Engine Wheelbase (ft / m)30 / 9.14
Ratio of driving wheelbase to overall engine wheelbase 0.51
Overall Wheelbase (engine & tender) (ft / m)58.08 / 17.70
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)160,000 / 72,575
Engine Weight (lbs / kg)197,000 / 89,358
Tender Loaded Weight (lbs / kg)130,000 / 58,967
Total Engine and Tender Weight (lbs / kg)327,000 / 148,325
Tender Water Capacity (gals / ML)7000 / 26.52
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)12 / 11
Minimum weight of rail (calculated) (lb/yd / kg/m)67 / 33.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)22" x 28" / 559x711
Tractive Effort (lbs / kg)37,026 / 16794.73
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.32
Heating Ability
Tubes (number - dia) (in / mm)344 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14.50 / 4.42
Firebox Area (sq ft / m2)194.90 / 18.11
Grate Area (sq ft / m2)34.90 / 3.24
Evaporative Heating Surface (sq ft / m2)2792 / 259.38
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2792 / 259.38
Evaporative Heating Surface/Cylinder Volume226.62
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6282
Same as above plus superheater percentage6282
Same as above but substitute firebox area for grate area35,082
Power L15136
Power MT283.07

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Wes Barris