Data from MKT 1904 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 20, p. 37. (Thanks to Chris Hohl for his 9 April 2018 email reporting the correct valve gear and cylinder diameter.; and many thanks to Greg Maxwell for his 20 May 2019 email describing the role played by the Atlantics.) Works numbers were 14346 in July 1895 and 14455-14460 in August.
Pretty unusual Atlantics for the time. Note the small drivers, which rolled on the tallest drivers used on the MKT up to that time, 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.The Baldwin spec was quite specific (so to speak) when they noted that the last locomotive would use 19 1/2" (495 mm) cylinders. The larger cans inched the calculated tractive effort to 21,610 lb (9,802 kg or 96.1 kN).
When he composed this entry in 2011, Locobase didn't know what motivated the MKT to buy these 4-4-2s. Greg Maxwell sent a well-written explanation that has two parts.The first part refers to the N class Vauclain compound Ten-wheelers bought in 1893. They proved unequal to the task and the 1893 Panic overmatched the Katy Flyer's appeal. Maxwell picks up the story later: "When the Missouri Kansas & Eastern reached St Louis in 1895 the Katy Flyer was resurrected. The 4-4-2s, delivered in a fancy two-tone green paint scheme to match the Wagner Palace Cars, were acquired to replace the compound 4-6-0s as power the Flyer."
Locobase notes that, whatever the reasons for this Atlantic design, the purchase didn't go to waste. The class gave almost three decades of service before being scrapped in 1923-1924.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | M/E/I |
| Locobase ID | 7085 |
| Railroad | Missouri-Kansas-Texas (MKT) |
| Country | USA |
| Whyte | 4-4-2 |
| Number in Class | 7 |
| Road Numbers | 296-302/201-207 |
| Gauge | Std |
| Number Built | 7 |
| Builder | Burnham, Williams & Co |
| Year | 1895 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6.25 / 1.90 |
| Engine Wheelbase (ft / m) | 24.17 / 7.37 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.26 |
| Overall Wheelbase (engine & tender) (ft / m) | 41.04 / 12.51 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 71,600 / 32,477 |
| Engine Weight (lbs / kg) | 131,750 / 59,761 |
| Tender Loaded Weight (lbs / kg) | 95,050 / 43,114 |
| Total Engine and Tender Weight (lbs / kg) | 226,800 / 102,875 |
| Tender Water Capacity (gals / ML) | 4300 / 16.29 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 9 / 8 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 60 / 30 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 70 / 1778 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 26" / 483x660 |
| Tractive Effort (lbs / kg) | 20,515 / 9305.46 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.49 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 241 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 14.25 / 4.34 |
| Firebox Area (sq ft / m2) | 147.60 / 13.72 |
| Grate Area (sq ft / m2) | 28.10 / 2.61 |
| Evaporative Heating Surface (sq ft / m2) | 1935 / 179.83 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1935 / 179.83 |
| Evaporative Heating Surface/Cylinder Volume | 226.85 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5058 |
| Same as above plus superheater percentage | 5058 |
| Same as above but substitute firebox area for grate area | 26,568 |
| Power L1 | 6581 |
| Power MT | 405.27 |