Wabash 2-6-0 "Mogul" Type Locomotives

Class F-1/F-2/F-3 (Locobase 6928)

Data from WAB 1 - 1907 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Three Mogul classes rolled into one by the diagram book. It breaks down the classes into 11 F-1 from Rome Locomotive Works, 3 F-2 and 1 F-3 from Baldwin -- the latter with 19"-diameter cylinders.

Class F-4 (Locobase 6927)

Data from WAB 1 - 1907 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Relatively small boiler, relatively big grate and generous direct heating surface area for a turn-of-the-century North American Mogul. Richmond supplied 7, Rhode Island 12, and Baldwin 5.

Class F-5 (Locobase 6929)

Data from WAB 1 - 1907 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

As part of the worldwide interest in compounding, Rhode Island (3) and Richmond (1) supplied these four 2-cylinder cross-compound versions of the F-4 (Locobase 6928) to the Wabash. By 1917 they had been converted to simple-expansion F-4s.

Class F-6 (Locobase 6930)

Data from WAB 1 - 1907 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Apparently the results from the first 4 compound Moguls (Locobase 6929) were favorable, so favorable that the Wabash had Baldwin produce 31 and Richmond supply 35 in 1901-1903. By 1917, however, only 5 had not been converted to simple-expansion F-7s. For the latter, see Locobase 6931.

Class F-7 (Locobase 6931)

Data from WAB 1 - 1907 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

The F-6 Moguls (Locobase 6930) were of serviceable size, but their compound cylinder arrangement disappointed their operator soon after the large class of cross-compounds entered service. By 1917, only a few were left unchanged.

Meanwhile, Baldwin was delivering the simple-expansion twins to the F-6 compounds. By 1917, the new-builds and the makeovers together comprised the one of the largest single Mogul classes on any railroad.

On they went, decade after decade, in part because their axle loading was so low. Drury (1993) says that 4 were retained until 1955 because the Keokuk Bridge over the Illinois River couldn't handle anything heavier. And, like the other Wabash 2-6-0s, they steamed well with a generous portion of direct heating surface and a relatively large grate.

Specifications
Class	F-1/F-2/F-3	F-4	F-5	F-6	F-7
Locobase ID	6928	6927	6929	6930	6931
Railroad	Wabash	Wabash	Wabash	Wabash	Wabash
Whyte	2-6-0	2-6-0	2-6-0	2-6-0	2-6-0
Road Numbers	266-267	756-778	752-755	801-866	801+, 867-901
Gauge	Std	Std	Std	Std	Std
Builder	serveral	several	several	several	shops
Year	1884	1899	1899	1901	1904
Valve Gear	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson
	Locomotive Length and Weight
Driver Wheelbase	12.67'	14'	14'	14'	14'
Engine Wheelbase	20.12'	22.33'	22.58'	23.58'	22.58'
Ratio of driving wheelbase to overall engine wheebase	0.63	0.63	0.62	0.59	0.62
Overall Wheelbase (engine & tender)	44.96'	48.49'	48.68'	51.17'	51.17'
Axle Loading (Maximum Weight per Axle)	25400 lbs	37590 lbs	37590 lbs	47250 lbs	47250 lbs
Weight on Drivers	75000 lbs	105525 lbs	105525 lbs	128512 lbs	128512 lbs
Engine Weight	86000 lbs	123525 lbs	123525 lbs	149524 lbs	149524 lbs
Tender Light Weight	75500 lbs	96300 lbs	96300 lbs	120700 lbs	120700 lbs
Total Engine and Tender Weight	161500 lbs	219825 lbs	219825 lbs	270224 lbs	270224 lbs
Tender Water Capacity				6000 gals	6000 gals
Tender Fuel Capacity (oil/coal)					10 tons
Minimum weight per yard of rail on which locomotive could run	41.67 lb rail	58.62 lb rail	58.62 lb rail	71.40 lb rail	71.40 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	51"	63"	63"	63"	64"
Boiler Pressure	160 psi	195 psi	195 psi	200 psi	200 psi
Cylinders (dia x stroke)	18" x 22"	19" x 28"	20.5" x 28" (1)	20.5" x 28" (1)	19" x 28"
Tractive Effort	19008 lbs	26594 lbs	22147 lbs	22715 lbs	26849 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	3.95	3.97	4.76	5.66	4.79
	Heating Ability
Firebox Area	110 sq. ft	163.96 sq. ft	163.96 sq. ft	192 sq. ft	192 sq. ft
Grate Area	22.50 sq. ft	31.97 sq. ft	31.97 sq. ft	33.25 sq. ft	33.25 sq. ft
Evaporative Heating Surface	1187	1607	1607	1907	1907
Superheating Surface
Combined Heating Surface	1187	1607	1607	1907	1907
Evaporative Heating Surface/Cylinder Volume	183.19	174.89	300.47	356.57	207.54
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	3600	6234.15	6234.15	6650	6650
Same as above plus superheater percentage	3600	6234.15	6234.15	6650	6650
Same as above but substitute firebox area for grate area	17600	31972.20	31972.20	38400	38400
Power L1	3645.82	5407.75	3696.47	4478.95	6656.49
Power MT	321.51	338.93	231.68	230.51	342.58