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

Class Details by Steve Llanso of Sweat House Media

Class 30 (Locobase 14536)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 77, pp. 652+. Works numbers were 60924-60926 in October 1929.

The IT contracted for this trio of Mikados in March 1929, only months before the big Crash of 1929 sent the economy spinning. Fittingly for a road that finally moved past Moguls in its motive power array and skipped Consolidations, the 30s' design was relatively small and light for a North American standard-gauge 2-8-2.

It was late enough in the game, however, for the road to include 76 sq ft (7.05 sq m) of thermic syphons in the firebox heating surface area, 14" (356 mm) piston valves,.and install a relatively large amount of superheater area.

All three served the IT until 1950, when the road's conversion to diesel-electric motive power resulted in 32's being sold for scrap in February followed by 31 in April and 30 in May.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14,536
RailroadIllinois Terminal
Number in Class3
Road Numbers30-32
Number Built3
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)15 / 4.57
Engine Wheelbase (ft / m)33.58 / 10.24
Ratio of driving wheelbase to overall engine wheebase 0.45
Overall Wheelbase (engine & tender) (ft / m)71.87 / 21.91
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)210,000 / 95,255
Engine Weight (lbs / kg)262,000 / 118,841
Tender Loaded Weight (lbs / kg)185,000 / 83,915
Total Engine and Tender Weight (lbs / kg)447,000 / 202,756
Tender Water Capacity (gals / ML)10,000 / 37.88
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)16 / 14.50
Minimum weight of rail (calculated) (lb/yd / kg/m)88 / 44
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55 / 1397
Boiler Pressure (psi / kPa)185 / 12.80
High Pressure Cylinders (dia x stroke) (in / mm)25" x 30" / 635x762
Tractive Effort (lbs / kg)53,608 / 24316.21
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.92
Heating Ability
Firebox Area (sq ft / m2)318 / 29.54
Grate Area (sq ft / m2)66.60 / 6.19
Evaporative Heating Surface (sq ft / m2)3665 / 340.49
Superheating Surface (sq ft / m2)896 / 83.24
Combined Heating Surface (sq ft / m2)4561 / 423.73
Evaporative Heating Surface/Cylinder Volume215.03
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation12,321
Same as above plus superheater percentage14,785
Same as above but substitute firebox area for grate area70,596
Power L113,252
Power MT556.49

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Wes Barris