Missouri-Kansas-Texas 4-4-2 "Atlantic" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class M/E/I (Locobase 7085)

Data from MKT 1904 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 20, p. 37. Works numbers were 14346 in July 1895 and 14455-14460 in August.

Pretty unusual Atlantics for the time. Note the small drivers, 50" trailing wheels, a very long, straight boiler with the steam dome over the second driving axle and sand dome just ahead of the first set of drivers. Locobase doesn't know what motivated the MKT to buy these 4-4-2s.

Locobase notes that, whatever the reasons, the purchase didn't go to waste; these gave almost three decades of service before being scrapped in 1923-1924.

Specifications by Steve Llanso of Sweat House Media
Locobase ID7085
RailroadMissouri-Kansas-Texas (MKT)
Number in Class7
Road Numbers296-302/201-207
Number Built7
BuilderBurnham, Williams & Co
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase 6.25'
Engine Wheelbase24.17'
Ratio of driving wheelbase to overall engine wheebase 0.26
Overall Wheelbase (engine & tender)41.04'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers71600 lbs
Engine Weight131750 lbs
Tender Light Weight95050 lbs
Total Engine and Tender Weight226800 lbs
Tender Water Capacity4300 gals
Tender Fuel Capacity (oil/coal)9 tons
Minimum weight of rail (calculated)60 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter70"
Boiler Pressure180 psi
Cylinders (dia x stroke)19" x 26"
Tractive Effort20515 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.49
Heating Ability
Firebox Area147.60 sq. ft
Grate Area28.10 sq. ft
Evaporative Heating Surface1935 sq. ft
Superheating Surface
Combined Heating Surface1935 sq. ft
Evaporative Heating Surface/Cylinder Volume226.79
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5058
Same as above plus superheater percentage5058
Same as above but substitute firebox area for grate area26568
Power L16579
Power MT405.15

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