Kansas City & Memphis 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 7 (Locobase 14153)

Data from DeGolyer, Vol 48, p. 277. Works number was 40671 in September 2013.

This was the second railroad to be chartered as the Kansas City & Memphis, incorporating on 17 December 1910. Its main lines linked Rogers and Fayetteville, Ark (30 miles), Cave Springs and Siloam Springs (20 miles), and Freeman to Monte Ne (6 miles). The company absorbed both the Arkansas, Oklahoma & Western and the Monte Ne Railways.

By July 1914, not after the railroad took delivery of this superheated freight Ten-wheeler, the KC&M went into receivership. The property was bid in a foreclosure sale a little more than four years later in October 1918.

At that time, the 7 was sold to the Midland Valley, which operated the engine for about nine years before being sold in December 1927 to the Missouri & Arkansas, which renumbered it 21. The M&A, which was based in Harrison, Ark, proved to be the 21's longest-running employer, running it for better than two decades before scrapping it in 1949.

Specifications by Steve Llanso of Sweat House Media
Locobase ID14,153
RailroadKansas City & Memphis
Number in Class2
Road Numbers7
Number Built2
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)14
Engine Wheelbase (ft)24.83
Ratio of driving wheelbase to overall engine wheebase 0.56
Overall Wheelbase (engine & tender) (ft)53.58
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)116,000
Engine Weight (lbs)154,000
Tender Loaded Weight (lbs)140,000
Total Engine and Tender Weight (lbs)294,000
Tender Water Capacity (gals)7000
Tender Fuel Capacity (oil/coal) (gals/tons)12
Minimum weight of rail (calculated) (lb/yd)64
Geometry Relating to Tractive Effort
Driver Diameter (in)64
Boiler Pressure (psi)200
High Pressure Cylinders (dia x stroke) (in)21" x 26"
Tractive Effort (lbs)30,457
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.81
Heating Ability
Firebox Area (sq ft)161
Grate Area (sq ft)27
Evaporative Heating Surface (sq ft)1686
Superheating Surface (sq ft)337
Combined Heating Surface (sq ft)2023
Evaporative Heating Surface/Cylinder Volume161.76
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5400
Same as above plus superheater percentage6318
Same as above but substitute firebox area for grate area37,674
Power L111,306
Power MT644.62