Missouri-Kansas-Texas 4-6-0 "Ten-wheeler" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 336 / G-6 (Locobase 12843)

Data from DeGolyer, Volume 28, p.145. See also ICS, International Library of Technology, Tandem and Balanced Compound, inter alia, p. 90, Works numbers were 27093-27094 in December 1905.

This pair of Ten-wheelers used the balanced-compound setup described in Locobase 5304. The HP and LP cylinders on each side were served by a single 15" piston valve, but each cylinder had its own crosshead and crank.

After 15 years in service and one renumbering, the two were converted to simple-expansion 20" x 26" operation. The MKT scrapped the 247 in February 1931 and the 246 in August of the same year.


Class F2 (Locobase 7712)

Data from MKT 1904 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 21154-21155, 21170, 21176 in October 1902; 21210-21211, 21335-21336 in November; and 21404, 21411 in December.

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.

All served for about 30 years and all were scrapped in January-March 1931.


Class G-5-b (Locobase 7734)

Data from MKT 1946 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 28, p. 144. Works numbers were 27086, 27087, 27110-27113, 27153-27154 in December 1905.

These light Ten-wheelers were the middle set of three G-5 subclasses. Ordered at the same time as the last set of Moguls (see Locobase ), they shared many components supplied by other manufacturers during their production:

WestinghouseAmerican air-brakes

"Simplicity" bell ringer

National-Hollow brake-beams

Diamond "S" and steel Insert brake-shoes

Buckeye tender couplers

Leeds reversible pilot couplers

Pyle-National electric headlights

Monitor injectors

U. S. metallic piston and valve rod packings

Coale safety valves

Leach pneumatic sanding devices

Nathan sight-feed lubricators

Railway Steel Spring Co.'s springs

Ashcroft steam gauges

Standard Steel Works driving and truck wheel tires

Safety Car Heating & Lighting Co.'s steam heat equipment for 10-wheel locomotives.

Unlike many Katy locomotives, these were never superheated and retained their slide valves to the end of their service.

Drury (1993) explains that as Pacific types took over the runs they had handled, they "found themselves unemployed ...by 1940 all were gone." Indeed, according to Connelly's list, the first two -- 231, 233 --were scrapped in April 1923. 236 went to the ferro-knacker's in November 1924, 237 went in May 1929, 331 and 335 were scrapped in February 1931, and the last two -- 232, 235 -- went in March 1931.


Class G-8-a (Locobase 7735)

Data from MKT 1946 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 28818-28820, 28842-28844, 28857, 28904-28905, 28913 in August 1906.

These Ten-wheelers were part of a series of relatively high-drivered 4-6-0s that constituted passenger power on the Katy until the Pacifics came along.

As shown in this entry, the MKT later superheated the boilers and fitted piston valves, but retained the inside Stephenson link motion. All Ten-wheelers had been retired by 1940.


Class G-8-b (Locobase 7736)

Data from MKT 1946 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Although the Baldwins of 1906 (Locobase 7735) were the first of the fast passenger Ten-wheelers on the Katy, these Schenectady locomotives were larger and outnumbered the earlier engines. The present entry shows this set in its superheated update with piston valves actuated by inside Stephenson link motion.


Class N/F (13 1/2) (Locobase 7726)

Data from MKT 1903 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 18, p.255. Works numbers were 13708-13709, 13712, 13716-13718, 13735-13736, 13754 in September 1893.

The Katy dabbled with Ten-wheeler Vauclain compounds for a few years. All were delivered with a 26" stroke in the cylinders; Locobase 7727 shows the three converted to larger cylinder volume by adding two inches to the stroke and increasing cylinder diameters. Each of two 11 1/2" (292 mm) piston valves admitted steam to the LP and HP cylinders on that side.

The Baldwin spec shows an incorrect tube heating surface area of 1,603 sq ft (148.92 sq m), which would result from a calculation using a tube length of 13 ft 5 in (4.09 m).

In 1907, this class was converted to simple expansion when they were fitted with 19" x 26" cylinders and designated Class F.

287 blew up in February 1911. The others were scrapped between February 1923 and June 1925.


Class N/F (14) (Locobase 7727)

Data from MKT 1903 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 1893.

As noted in Locobase 7726, nine Ten-wheelers were ordered as Vauclain compounds whose cylinders had a 26" stroke. Apparently three of the class--possibly through an Extra Work order at Baldwin before their delivery--adopted larger cylinders with a 28" stroke, presumably as a way to afford more volume for expansion. Given that the benchmark for best compounding success was usually an LP/HP ratio of about 2.4:1, the 2.9:1 ratio in this class seems out of balance.

In 1907, all three engines would be converted to simple expansion with 19" HP cylinders.

293 was scrapped in July 1924 with 294 following in September.


Class R/F1 (Locobase 7728)

Data from MKT 1903 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 22, p. 163. Works numbers were 17112-17116 in October 1899.

It was unusual for Baldwin to overestimate its locomotives' weights in the original specifications, but this order included an adhesion weight of "about 105,000 lbs. [47,627 kg] " The cylinders were the same as those used in a contemporary MKT Atlantic design.

216-217 and 220 were sold for scrap in 1923-1924. 219 was sold to the Texas & Oklahoma Railway in October 1923. Scrap dealer Hyman-Michaels bought the 218 in July 1924, but sold it to the Oklahoma City, Ada & Atoka. The OCA&A operated it a few years more before selling it for scrap in 1929.

Specifications by Steve Llanso of Sweat House Media
Class336 / G-6F2G-5-bG-8-aG-8-b
Locobase ID12843 7712 7734 7735 7736
RailroadMissouri-Kansas-Texas (MKT)Missouri-Kansas-Texas (MKT)Missouri-Kansas-Texas (MKT)Missouri-Kansas-Texas (MKT)Missouri-Kansas-Texas (MKT)
CountryUSAUSAUSAUSAUSA
Whyte4-6-04-6-04-6-04-6-04-6-0
Number in Class21081021
Road Numbers336-337 / 246-247308-317 / 248-257328-335/231-238258-267268-288
GaugeStdStdStdStdStd
Number Built21081021
BuilderBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & CoAlco-Schenectady
Year19051902190519061909
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase13.50' 8.50'13.33'13.83'13.83'
Engine Wheelbase27.58'23.25'24.58'25.17'25.17'
Ratio of driving wheelbase to overall engine wheebase 0.49 0.37 0.54 0.55 0.55
Overall Wheelbase (engine & tender)44.71'56.46'57.06'60.62'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers116500 lbs128360 lbs104000 lbs132450 lbs143000 lbs
Engine Weight157800 lbs163350 lbs147400 lbs179950 lbs184500 lbs
Tender Light Weight126650 lbs138000 lbs136600 lbs158000 lbs
Total Engine and Tender Weight290000 lbs285400 lbs316550 lbs342500 lbs
Tender Water Capacity6500 gals6000 gals6500 gals6500 gals8000 gals
Tender Fuel Capacity (oil/coal)10 tons12 tons2720 gals2720 gals2720 gals
Minimum weight of rail (calculated)65 lb/yard71 lb/yard58 lb/yard74 lb/yard79 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter68"72"68"73"73"
Boiler Pressure220 psi200 psi200 psi200 psi200 psi
High Pressure Cylinders (dia x stroke)15" x 26"20" x 26"19" x 26"20" x 28"21" x 28"
Low Pressure Cylinders (dia x stroke)25" x 26" (2)
Tractive Effort23658 lbs24556 lbs23465 lbs26082 lbs28756 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.92 5.23 4.43 5.08 4.97
Heating Ability
Firebox Area160.60 sq. ft171 sq. ft141 sq. ft162 sq. ft163 sq. ft
Grate Area31.10 sq. ft30.97 sq. ft28.60 sq. ft30.60 sq. ft31.50 sq. ft
Evaporative Heating Surface2654 sq. ft2742 sq. ft2329 sq. ft1722 sq. ft1986 sq. ft
Superheating Surface372 sq. ft500 sq. ft
Combined Heating Surface2654 sq. ft2742 sq. ft2329 sq. ft2094 sq. ft2486 sq. ft
Evaporative Heating Surface/Cylinder Volume499.08290.04272.97169.14176.93
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation68426194572061206300
Same as above plus superheater percentage68426194572072227560
Same as above but substitute firebox area for grate area3533234200282003823239120
Power L15835913280601405415827
Power MT331.26470.53512.57701.78732.01

Specifications by Steve Llanso of Sweat House Media
ClassN/F (13 1/2)N/F (14)R/F1
Locobase ID7726 7727 7728
RailroadMissouri-Kansas-Texas (MKT)Missouri-Kansas-Texas (MKT)Missouri-Kansas-Texas (MKT)
CountryUSAUSAUSA
Whyte4-6-04-6-04-6-0
Number in Class935
Road Numbers287-295287, 294-295303-307/216-220
GaugeStdStdStd
Number Built95
BuilderBurnham, Williams & CoMKTBurnham, Williams & Co
Year189318931899
Valve GearStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase12.33'12.33'13.33'
Engine Wheelbase24.17'24.17'24.42'
Ratio of driving wheelbase to overall engine wheebase 0.51 0.51 0.55
Overall Wheelbase (engine & tender)42.60'42.60'51.92'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers104400 lbs104400 lbs98230 lbs
Engine Weight139400 lbs139400 lbs136000 lbs
Tender Light Weight86600 lbs86600 lbs95600 lbs
Total Engine and Tender Weight226000 lbs226000 lbs231600 lbs
Tender Water Capacity4000 gals4000 gals4300 gals
Tender Fuel Capacity (oil/coal)8 tons8 tons9 tons
Minimum weight of rail (calculated)58 lb/yard58 lb/yard55 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"69"62"
Boiler Pressure180 psi180 psi180 psi
High Pressure Cylinders (dia x stroke)13.5" x 26"14" x 28"19.5" x 26"
Low Pressure Cylinders (dia x stroke)23" x 26" (2)24" x 28" (2)
Tractive Effort15630 lbs18159 lbs24397 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.68 5.75 4.03
Heating Ability
Firebox Area136.50 sq. ft132 sq. ft142 sq. ft
Grate Area23 sq. ft23 sq. ft29.10 sq. ft
Evaporative Heating Surface1803 sq. ft1803 sq. ft2139 sq. ft
Superheating Surface
Combined Heating Surface1803 sq. ft1803 sq. ft2139 sq. ft
Evaporative Heating Surface/Cylinder Volume418.58361.41238.01
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation414041405238
Same as above plus superheater percentage414041405238
Same as above but substitute firebox area for grate area245702376025560
Power L1411534785896
Power MT260.69220.34396.98


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