Grant delivered most of the locomotives in 1871-1872; McQueen contributed one in 1876
Part of a series of MKT Eight-wheelers with the same power dimensions, this was too a relatively small engine. A couple of years later, Baldwin followed with slightly larger locomotives; see Locobase 7706.
Locobase knows only what the diagram tells him and it says that for the period, this was a small Eight-wheeler. Moreover, the Grant & McQueen engines of nearly a decade earlier (Locobase 7704) had the same general dimensions.
Rogers and Mason Locomotive Works produced this order in the early '70s. Mason delivered 6, Rogers 9. Otherwise quite typical of the time, this class had a small grate.
Baldwin's earlier A3 (Locobase 7705) had power dimensions similar to most other Katy Eight-wheelers of the time. This class had slightly larger cylinders and saw increases in most key measurements. Danforth, Cooke added 3 in 1882.
In keeping with the rest of the MKT's Eight-wheelers, this design was small for its period.
Although considerably bigger than other MKT Eight-wheelers still on the books in 1904, this class sat in the middle of the rankings for North American 4-4-0s of the period.
This pair was built by the Katy at the same time as the B2s shown in Locobase 7709, but these had taller drivers and hence a longer wheelbase.
Locobase found two diagrams for engines in this class, one for C-class "278-281" with 63" drivers and the other for the range and dimensions shown in this entry. It seems likely that some locomotives were delivered with 18"-diameter cylinders, but soon upgraded to the 18 1/2" cylinder even as it adopted the taller drivers.
The Parsons shop built this pair of Eight-wheelers in what seems to have been an effort to upgrade 4-4-0 power.
These were rebuilds of 4-4-0s (probably the C2s shown in Locobase 7713) that the Katy had originally procured in the 1890s. One wonders how much of the original engine was left. The grate was smaller, the boiler revamped with superheater flues, piston valves replaced slide valves. On the other hand, the wheelbases remained the same and the boiler's overall dimensions were essentially unchanged.
Trundling along on light branch lines, some of these rebuilds lasted to the end of steam on the MKT.
| Specifications | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Class | A | A | A | B | B | B1 | B2 | B4 | C2 | C3 | E3 |
| Locobase ID | 7704 | 7705 | 7703 | 7707 | 7706 | 7708 | 7709 | 7711 | 7713 | 7714 | 7732 |
| Railroad | Missouri-Kansas-Texas (MKT) | Missouri-Kansas-Texas (MKT) | Missouri-Kansas-Texas (MKT) | Missouri-Kansas-Texas (MKT) | Missouri-Kansas-Texas (MKT) | Missouri-Kansas-Texas (MKT) | Missouri-Kansas-Texas (MKT) | Missouri-Kansas-Texas (MKT) | Missouri-Kansas-Texas (MKT) | Missouri-Kansas-Texas (MKT) | Missouri-Kansas-Texas (MKT) |
| Whyte | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 |
| Road Numbers | 29, 33, 36-38, 16 | 72-73, 80, 84-88, 107 | 53-58, 61, 62-67, 70-71 | 74-75, 77-82, 147, 198, | 104,110,117,121,124,126 | 13,47,49,166,168 | 114-115 | 277-284 | 273-274 | 306-317 | |
| Gauge | Std | Std | Std | Std | Std | Std | Std | Std | Std | Std | Std |
| Builder | several | Burnham, Parry, Williams & Co | Danforth, Cooke | several | Burnham, Parry, Williams & Co | Dickson | MKT | MKT | Burnham, Parry, Williams & Co | MKT | MKT |
| Year | 1871 | 1876 | 1880 | 1873 | 1878 | 1886 | 1890 | 1890 | 1890 | 1902 | 1923 |
| Valve Gear | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson |
| Locomotive Length and Weight | |||||||||||
| Driver Wheelbase | 8' | 8' | 8' | 8' | 8' | 8' | 8' | 8.50' | 8.67' | 8.67' | 8.67' |
| Engine Wheelbase | 21.73' | 22.54' | 22.50' | 21.83' | 22.46' | 22.17' | 23' | 23.25' | 23.83' | 24.08' | 23.83' |
| Ratio of driving wheelbase to overall engine wheebase | 0.37 | 0.35 | 0.36 | 0.37 | 0.36 | 0.36 | 0.35 | 0.37 | 0.36 | 0.36 | 0.36 |
| Overall Wheelbase (engine & tender) | 44.56' | 44.75' | 44.75' | 44.33' | 45' | 43.71' | 45.71' | 44.71' | 47.33' | 49.54' | 50.21' |
| Axle Loading (Maximum Weight per Axle) | |||||||||||
| Weight on Drivers | 45500 lbs | 46500 lbs | 46500 lbs | 44000 lbs | 50000 lbs | 47800 lbs | 55000 lbs | 55500 lbs | 65000 lbs | 77000 lbs | 76400 lbs |
| Engine Weight | 70000 lbs | 73500 lbs | 73500 lbs | 70500 lbs | 80500 lbs | 75800 lbs | 88000 lbs | 88000 lbs | 102000 lbs | 122000 lbs | 123000 lbs |
| Tender Light Weight | 67800 lbs | 69700 lbs | 71900 lbs | 69900 lbs | 67500 lbs | 64200 lbs | 74000 lbs | 74000 lbs | 76100 lbs | 117200 lbs | 102800 lbs |
| Total Engine and Tender Weight | 137800 lbs | 143200 lbs | 145400 lbs | 140400 lbs | 148000 lbs | 140000 lbs | 162000 lbs | 162000 lbs | 178100 lbs | 239200 lbs | 225800 lbs |
| Tender Water Capacity | 3000 gals | 3000 gals | 3000 gals | 3000 gals | 3000 gals | 2720 gals | 3400 gals | 3400 gals | 3400 gals | 5500 gals | 5000 gals |
| Tender Fuel Capacity (oil/coal) | 7.5 tons | 7 tons | 7.5 tons | 7 tons | 7 tons | 7.5 tons | 7 tons | 7 tons | 8 tons | 10 tons | 2226 gals |
| Minimum weight per yard of rail on which locomotive could run | 38 lb rail | 39 lb rail | 39 lb rail | 37 lb rail | 42 lb rail | 40 lb rail | 46 lb rail | 46 lb rail | 54 lb rail | 64 lb rail | 64 lb rail |
| Geometry Relating to Tractive Effort | |||||||||||
| Driver Diameter | 62" | 62" | 62" | 62" | 62" | 60" | 63" | 68" | 69" | 69" | 69" |
| Boiler Pressure | 140 psi | 140 psi | 140 psi | 140 psi | 140 psi | 145 psi | 150 psi | 150 psi | 160 psi | 190 psi | 180 psi |
| Cylinders (dia x stroke) | 16" x 24" | 16" x 24" | 16" x 24" | 17" x 24" | 17" x 24" | 17" x 24" | 17" x 24" | 17" x 24" | 18.5" x 24" | 18.5" x 26" | 18" x 24" |
| Tractive Effort | 11793 lbs | 11793 lbs | 11793 lbs | 13313 lbs | 13313 lbs | 14248 lbs | 14037 lbs | 13005 lbs | 16190 lbs | 20828 lbs | 17242 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.86 | 3.94 | 3.94 | 3.31 | 3.76 | 3.35 | 3.92 | 4.27 | 4.01 | 3.70 | 4.43 |
| Heating Ability | |||||||||||
| Firebox Area | 120 sq. ft | 121 sq. ft | 118 sq. ft | 120 sq. ft | 120 sq. ft | 120 sq. ft | 130 sq. ft | 140 sq. ft | 125 sq. ft | 158 sq. ft | 132 sq. ft |
| Grate Area | 15.30 sq. ft | 14.90 sq. ft | 14 sq. ft | 13.60 sq. ft | 15.10 sq. ft | 16.10 sq. ft | 17 sq. ft | 17 sq. ft | 17 sq. ft | 27.50 sq. ft | 15.60 sq. ft |
| Evaporative Heating Surface | 1054 | 956 | 1040 | 1069 | 1105 | 1078 | 1323 | 1333 | 1588 | 1740 | 1213 |
| Superheating Surface | 267 | ||||||||||
| Combined Heating Surface | 1054 | 956 | 1040 | 1069 | 1105 | 1078 | 1323 | 1333 | 1588 | 1740 | 1480 |
| Evaporative Heating Surface/Cylinder Volume | 188.72 | 171.17 | 186.21 | 169.55 | 175.26 | 170.98 | 209.83 | 211.42 | 212.68 | 215.11 | 171.60 |
| Computations Relating to Power Output (More Information) | |||||||||||
| Robert LeMassena's Power Computation | 2142 | 2086 | 1960 | 1904 | 2114 | 2335 | 2550 | 2550 | 2720 | 5225 | 2808 |
| Same as above plus superheater percentage | 2142 | 2086 | 1960 | 1904 | 2114 | 2335 | 2550 | 2550 | 2720 | 5225 | 3370 |
| Same as above but substitute firebox area for grate area | 16800 | 16940 | 16520 | 16800 | 16800 | 17400 | 19500 | 21000 | 20000 | 30020 | 28512 |
| Power L1 | 4284 | 4043 | 4222 | 3829 | 3912 | 3859 | 4929 | 5482 | 5453 | 6834 | 12522 |
| Power MT | 415.15 | 383.37 | 400.34 | 383.70 | 344.98 | 355.97 | 395.15 | 435.52 | 369.90 | 391.33 | 722.68 |
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