Chicago & North Western / Chicago, St Paul, Minneapolis & Omaha 2-8-2 "Mikado" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class J (Locobase 6306)

Data from C & NW 10 - 1952 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

Firebox heating surface included 29.6 sq ft of arch tubes. Data from diagram. The first 192 delivered used Baker valve gear, the remainder moved steam with the Young gear, which had two rods, two links and allowed cutoffs to be set as high as 90% of stroke.

This class was the backbone of freight work on the Chicago & North Western. Many later saw a major increase in superheater area; see Locobase 8383.

Delivered over a period of 10 years, the class remained in widespread service well into the 1950s.


Class J (Locobase 4854)

Data from C&W 10 - 1952 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 52697-52706 in June 1913, 54520-54525 in April 1914, 55562-55567 in March 1916, and 56284-56293 in November.

The Omaha division actually was part of the Chicago & NorthWestern Railway, but it ordered and serviced its own locomotives. Even so, most of its classes were very similar to NorthWestern engines. This set of Js were virtually identical to the C&NW Js (Locobase 6306) , says Larry Bohn, author of the website members.lsol.net/mollyandmic/c393.htm. The only differences were the number of digits in the number and a missing horizontal cross-bar in the Omaha Js' cab windows.

Firebox heating surface included 29.6 sq ft of arch tubes.

Most of the class was rebuilt in 1937-1938 and redesignated Class Ja.


Class J-2 (Locobase 8385)

Data from C & NW 10 - 1952 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Schenectady works numbers were 61034-61037 in April 1919 and Richmond's works numbers were 62609-62614 in January 1921.

These were classic USRA Heavy Mikado engines with a slight difference in tube count. Schenectady delivered four in April 1919, but Richmond's six followed almost 2 years later in January 1921.


Class J-3 (Locobase 9)

Data from 1930 Locomotive Cyclopedia of Ameican Practice (New York: Simmons-Boardman Publishing Co, 1930), p. 111. Works numbers 67091-67092 in October 1926, and 67093-67098 in November.

According to http://members.lsol.net/mollyandmick/C437.htm (last accessed 1 June 2006), these were modernized USRA Heavy Mikados with Delta cast-steel trailing trucks, Type E superheater, and an exhaust steam injector. One remarkable feature of this class was the single diameter of tube used in the boiler - all 232 tubes measured 3 1/2" each.

432-435 were fitted with thermic syphons that added 84 sq ft (7.8 sq m) to the firebox heating surface in addition to the 14.3 sq ft (1.33 sq m) that remained of the arch tubes. This raised total direct heating surface from 307 sq ft to the 368.3 sq ft (28.5 sq m) shown in the specs.

Well-drafted with 14" (356 mm) piston valves, these Mikes saw steam out on the Chicago & North Western. Firebox heating surface includes 27 sq ft (2.5 sq m) of arch tubes.


Class J-A (Locobase 8383)

Data from C & NW 10 - 1952 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

This renovation of the original J (Locobase 6306) design saw a substantial increase in its superheater area as well as an increase in driver diameter. A few surrendered their arch tubes in favor of circulators. The 51 sq ft of the latter device increased the firebox heating surface to 281 sq ft. Subsidiary St Paul, Minneapolis & Omaha rebuilt many of its J-class locomotives (at least 23 of the 32, as far as Locobase can tell). These had exhaust-steam injectors.

Specifications by Steve Llanso of Sweat House Media
ClassJJJ-2J-3J-A
Locobase ID6306 4854 8385 9 8383
RailroadChicago & North Western (C&NW)Chicago, St Paul, Minneapolis & Omaha (C&NW)Chicago, St Paul, Minneapolis & Omaha (C&NW)Chicago, St Paul, Minneapolis & Omaha (C&NW)Chicago & North Western (C&NW)
CountryUSAUSAUSAUSAUSA
Whyte2-8-22-8-22-8-22-8-22-8-2
Number in Class3103210830
Road Numbers2300-2610390-421422-431432-4392554+
GaugeStdStdStdStdStd
Number Built31032108
BuilderAlco-SchenectadyAlco-SchenectadyAlcoAlco-SchenectadyC & NW
Year19131913191919261935
Valve GearvariousBakerWalschaertBaker or Youngvarious
Locomotive Length and Weight
Driver Wheelbase (ft / m)16.80 / 5.1216.80 / 5.1216.75 / 5.1116.75 / 5.1116.80 / 5.12
Engine Wheelbase (ft / m)37.60 / 11.4637.60 / 11.4636.08 / 1137.59 / 11.4637.25 / 11.35
Ratio of driving wheelbase to overall engine wheebase 0.45 0.45 0.46 0.45 0.45
Overall Wheelbase (engine & tender) (ft / m)72.30 / 22.0472.30 / 22.0471.62 / 21.8372.30 / 22.0469.56 / 21.20
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)229,500 / 104,100229,500 / 104,100239,000 / 108,409249,000 / 112,945237,000 / 107,502
Engine Weight (lbs / kg)304,500 / 138,119304,500 / 138,119320,000 / 145,150333,000 / 151,046319,000 / 144,696
Tender Loaded Weight (lbs / kg)175,400 / 79,560175,400 / 79,560183,800 / 83,370188,900 / 85,684184,000 / 83,461
Total Engine and Tender Weight (lbs / kg)479,900 / 217,679479,900 / 217,679503,800 / 228,520521,900 / 236,730503,000 / 228,157
Tender Water Capacity (gals / ML)8275 / 31.348275 / 31.3410,000 / 37.8810,000 / 37.889500 / 35.98
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)16 / 14.5016 / 14.5016 / 14.5016 / 14.5014 / 12.70
Minimum weight of rail (calculated) (lb/yd / kg/m)96 / 4896 / 48100 / 50104 / 5299 / 49.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)62 / 157562 / 157563 / 160063 / 160064 / 1626
Boiler Pressure (psi / kPa)185 / 12.80185 / 12.80200 / 13.80200.20 / 13.80200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)27" x 32" / 686x81327" x 32" / 686x81327" x 32" / 686x81327" x 32" / 686x81327" x 32" / 686x813
Tractive Effort (lbs / kg)59,167 / 26837.7359,167 / 26837.7362,949 / 28553.2263,012 / 28581.8061,965 / 28106.88
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.88 3.88 3.80 3.95 3.82
Heating Ability
Firebox Area (sq ft / m2)259.60 / 24.13259.60 / 24.13307 / 28.53368.30 / 34.22259.60 / 24.13
Grate Area (sq ft / m2)63.10 / 5.8663 / 5.8670.30 / 6.5370.30 / 6.5363.10 / 5.86
Evaporative Heating Surface (sq ft / m2)4154 / 386.064154 / 386.064283 / 398.054020 / 373.613795 / 352.70
Superheating Surface (sq ft / m2)890 / 82.71890 / 82.71993 / 92.292000 / 185.871112 / 103.35
Combined Heating Surface (sq ft / m2)5044 / 468.775044 / 468.775276 / 490.346020 / 559.484907 / 456.05
Evaporative Heating Surface/Cylinder Volume195.89195.89201.97189.57178.96
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11,67411,65514,06014,07412,620
Same as above plus superheater percentage13,77513,75316,73118,71815,523
Same as above but substitute firebox area for grate area56,67156,67173,06698,06663,862
Power L112,13612,13614,61223,65415,192
Power MT466.32466.32539.14837.72565.28

Reference