Kansas, Oklahoma & Gulf / Midland Valley / Missouri, Oklahoma & Gulf 2-8-2 "Mikado" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class 401 (Locobase 9473)

Data from 1944 KO & G Locomotive Diagrams book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. A summary of the Muskogee Company empire appears in the Muskogee Company records, DeGolyer Library, Southern Methodist University, http://www.lib.utexas.edu/taro/smu/00131/smu-00131.html, last accessed 26 April 2015.

Works numbers were 42648-42651 in November 1915.

This quartet of moderately sized Mikados arrived only a couple of years before the MO&G suffered terminal bankruptcy. In its place rose the Kansas, Oklahoma & Gulf , still possessing that one 9-mile bridge line between Baxter Springs, Kansas and Denison, Texas. (Locobase realizes that, despite its diminuitive size, the KO & G consequently had to acknowledge the enforcement power of the Federal ICC and two state railroad commissions.)


Class 601 (Locobase 17)

Data from 1944 KO & G Locomotive Diagrams book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also the illustration and data in Locomotive cyclopedia of American practice, 1950-52 (New York: Simmons-Boardman Company, 1952), p. 510. (Thanks to Chris Hohl for his 5 July 2017 email supplying the tender's water and coal capacities.) Works numbers were 70889-70890 in October 1944.

Firebox heating surface area included supplemental devices (e.g., combustion chamber, arch tubes, thermic syphons, or security circulators, likely in combination), but neither source specifies which ones.

The Handbook of Texas Online -- http://www.tsha.utexas.edu/handbook/online/articles/view/KK/eqk6.html -- is the source for the brief biography of the railway. A summary of the Muskogee Company empire appears in the Muskogee Company records, DeGolyer Library, Southern Methodist University, http://www.lib.utexas.edu/taro/smu/00131/smu-00131.html, last accessed 26 April 2015.

The Kansas, Oklahoma and Gulf Railway Company of Texas was chartered on March 28, 1910, as the Missouri, Oklahoma and Gulf Railway Company of Texas. On 2 April 1921, the MO&G Rwy changed its name to the KO&G. Remarkably, this railroad retained its independent identity even though its main line consisted of 9 miles between the Red River near Carpenter's Bluff and Denison, Texas. By 1926, it was part of the Muskogee Company's road system.

In 1926 the KO&G was classified as a Class II line by the Railroad Commission and owned one locomotive. During World War II, as part of an upgrade to its motive power, the railroad bought this pair of Mikados which were produced in October 1944. In 1952 the KO&G earned $259,392, almost all from freight. In 1964 the Kansas, Oklahoma and Gulf system was merged into the Texas and Pacific Railway Company, and the Texas trackage abandoned.


Class 70 (Locobase 6779)

Data from 1944 KO & G Locomotive Diagrams book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 53, pp. 245+., Volumel 65, pp. 183+; and "Recently Built Freight Engines of the Nevada Northern", Railway and Locomotive Engineering, Volume 30, No 7 (July 1917), p. 238. (Thanks to Chris Hohl for his 29 April 2015 email pointing out the two different tender capacities described below.) Works numbers were 45324-45325 in March 1917; 53135, 53157 in April 1920; and 55394-55396 in May 1922.

See Locobase 17 for a Handbook of Texas description of the KOG. (http://www.tsha.utexas.edu/handbook/online/articles/view/KK/eqk6.html -- the Handbook of Texas Online). A summary of the Muskogee Company empire appears in the Muskogee Company records, DeGolyer Library, Southern Methodist University, http://www.lib.utexas.edu/taro/smu/00131/smu-00131.html, last accessed 26 April 2015.

This class of Mikados faced relatively gentle grades and curves, with the former peaking at 0.6% and the curves arcing broadly at a maximum of 6 degrees (radii of 955 feet/291 metres). The RLE report contended that the two different short-haul freight engines were good examples of a builder striving for the same high level of efficiency built into the main-line engines. Considering the light rail (65-75 lb/yard or 32.5-37.5 kg/metre), and low axle loading, "the locomotive develops high hauling and steaming capacity." They had 12" (305 mm) piston valves.

The first four locomotives delivered in 1917 and 1920 had the 10 ton tenders shown in the specs. The last two trailed significantly larger tenders carrying 8,000 US gallons (30,280 litres) and 14 tons (12.7 tonnes) of coal; they weighed 161,000 lb (73,028 kg) fully loaded.

In 1923, the KOG come under the control of the Muskogee Company (owners of the Midland Valley and Oklahoma City-Ada-Atoka Railway) and came to be called one of the Muskogee Roads.


Class 90 (Locobase 6780)

Data from 1944 KO & G Locomotive Diagrams book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange and DeGolyer, Vol 74, pp. 20+ . Works numbers were 56694-56695 in July 1923. A summary of the Muskogee Company empire appears in the Muskogee Company records, DeGolyer Library, Southern Methodist University, http://www.lib.utexas.edu/taro/smu/00131/smu-00131.html, last accessed 26 April 2015.

(Thanks to Chris Hohl for his emails in May and December 2013 patiently noting inconsistencies in the two entries for these five Mikados.)

More than three years after the bulk of the United States Railroad Administration's Light Mikados had been delivered (Locobase 40), the MV went to Baldwin for a trio of duplicates. The 90 had the same relatively capacious 14" (356 mm) piston valves as did the government design as well as a firebox that featured 27 sq ft (2.5 sq m) of arch tubes and 50 sq ft (6.65 sq m) in the combustion chamber.

The Baldwin specs note the Midland Valley's 90 lb/yard (45 kg/metre) rail and the undemanding 0.6% maximum grades and 10 degree curves.

1923 was the year that the Kansas Oh

Two more produced to slightly different specs arrived in 1925; see Locobase 15332.

The MV was later absorbed by the Kansas, Oklahoma & Gulf.


Class 93 (Locobase 15332)

Data from DeGolyer, Vol 74, pp. 27+. A summary of the Muskogee Company empire appears in the Muskogee Company records, DeGolyer Library, Southern Methodist University, http://www.lib.utexas.edu/taro/smu/00131/smu-00131.html, last accessed 26 April 2015. (Thanks to Chris Hohl for his emails in May and December 2013 patiently noting inconsistencies in the two entries for these five Mikados and for a 10 April 2015 correction of the "10" gallons of tender water capacity.) Works numbers were 58305-58306 in March 1925.

When the MV ordered two more Light Mikado duplicates to accompany the three produced in 1923 (Locobase 6780), they specified the inclusion of three fewer small tubes. Virtually all of the other details were the same, including the 14" (356 mm) piston valves and 77 sq ft (7.15 sq m) of supplemental firebox heating surface area. Tender capacity grew, however.

Specifications by Steve Llanso of Sweat House Media
Class401601709093
Locobase ID9473 17 6779 6780 15,332
RailroadMissouri, Oklahoma & Gulf (KO&G)Kansas, Oklahoma & Gulf (KO&G)Midland Valley (KO&G)Midland Valley (KO&G)Midland Valley (KO&G)
CountryUSAUSAUSAUSAUSA
Whyte2-8-22-8-22-8-22-8-22-8-2
Number in Class52752
Road Numbers401-404601-60270-7690-9293-94
GaugeStdStdStdStdStd
Number Built522752
BuilderBaldwinBaldwinBaldwinBaldwinBaldwin
Year19151944191719231925
Valve GearSouthernWalschaertSouthernWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.25 / 4.3416.80 / 5.1215.25 / 4.6517 / 5.1816.75 / 5.11
Engine Wheelbase (ft / m)32.33 / 9.8536.90 / 11.2532.25 / 9.8336.42 / 11.1036.08 / 11
Ratio of driving wheelbase to overall engine wheebase 0.44 0.46 0.47 0.47 0.46
Overall Wheelbase (engine & tender) (ft / m)65.96 / 20.1078.50 / 23.9374.42 / 22.6869.42 / 21.1672.54 / 22.11
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)232,000 / 105,234223,500 / 101,378155,500 / 70,534221,000 / 100,244221,000 / 100,244
Engine Weight (lbs / kg)386,000 / 175,087299,500 / 135,851199,500 / 90,492292,000 / 132,449292,000 / 132,449
Tender Loaded Weight (lbs / kg)154,000 / 69,853226,000 / 102,512115,000 / 73,028161,000 / 73,028191,000 / 86,636
Total Engine and Tender Weight (lbs / kg)540,000 / 244,940525,500 / 238,363314,500 / 163,520453,000 / 205,477483,000 / 219,085
Tender Water Capacity (gals / ML)8000 / 30.3012,00060008000 / 30.3010,000 / 0.04
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)13 / 11.80161014 / 12.7016 / 14.50
Minimum weight of rail (calculated) (lb/yd / kg/m)97 / 48.5093 / 46.5065 / 32.5092 / 4692 / 46
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)52 / 132163 / 160057 / 144863 / 160063 / 1600
Boiler Pressure (psi / kPa)180 / 12.40200.20 / 13.80200 / 13.80200 / 13.80200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)23" x 28" / 584x71126" x 30" / 660x76222" x 28" / 559x71126" x 30" / 660x76226" x 30" / 660x762
Tractive Effort (lbs / kg)43,581 / 19768.0354,779 / 24847.3740,418 / 18333.3254,724 / 24822.4254,724 / 24822.42
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.32 4.08 3.85 4.04 4.04
Heating Ability
Firebox Area (sq ft / m2)238 / 22.12340 / 18.58193.50 / 17.98280 / 26.01230 / 21.37
Grate Area (sq ft / m2)57.20 / 5.3266.75 / 6.2046.80 / 4.3566.70 / 6.2066.70 / 6.20
Evaporative Heating Surface (sq ft / m2)3778 / 351.123562 / 331.042567 / 238.483777 / 350.893743 / 347.73
Superheating Surface (sq ft / m2)838 / 77.881002 / 89.68562 / 52.21882 / 81.94882 / 81.94
Combined Heating Surface (sq ft / m2)4616 / 4294564 / 420.723129 / 290.694659 / 432.834625 / 429.67
Evaporative Heating Surface/Cylinder Volume280.59193.22208.38204.88203.04
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,29613,363936013,34013,340
Same as above plus superheater percentage12,14916,30311,04515,87515,875
Same as above but substitute firebox area for grate area50,55183,04345,66666,64054,740
Power L114,49416,28313,25214,94014,616
Power MT550.93642.47751.53596.15583.22

Reference