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 (ft) 6.25
Engine Wheelbase (ft)24.17
Ratio of driving wheelbase to overall engine wheebase 0.26
Overall Wheelbase (engine & tender) (ft)41.04
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)71,600
Engine Weight (lbs)131,750
Tender Loaded Weight (lbs)95,050
Total Engine and Tender Weight (lbs)226,800
Tender Water Capacity (gals)4300
Tender Fuel Capacity (oil/coal) (gals/tons)9
Minimum weight of rail (calculated) (lb/yd)60
Geometry Relating to Tractive Effort
Driver Diameter (in)70
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)19" x 26"
Tractive Effort (lbs)20,515
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.49
Heating Ability
Firebox Area (sq ft)147.60
Grate Area (sq ft)28.10
Evaporative Heating Surface (sq ft)1935
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1935
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 area26,568
Power L16579
Power MT405.15

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