Chicago & Alton 2-6-0 "Mogul" Type Locomotives

Class F3 / K-18 (Locobase 9086)

Data from C&A 6 - 1918, C&A 12 1920, and C&A 1 - 1930 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers ran 17019-17028, 17058-17067 in September 1899, 17125-17130, 17137-17138, 17163-17169 in October.

Baldwin supplied 35 of the simple-expansion F3 and 15 of the 4-cylinder Vauclain compound F3a (for the latter, see Locobase 9087). The compounds were soon rebuilt as simple engines to the same design. For a while in the 20s, virtually all of the class rode on 62" drivers like those on the F4 (Locobase 9088), which reduced tractive effort to 30,710 lb. They had all reclaimed their 57" wheels by 1930.

Soon after the Baltimore & Ohio took over the Alton, it scrapped or sold off most of the class. A couple of K-18s lasted into the late 1940s.

Class F3a (Locobase 9087)

Data from C&A 6 - 1918, C&A 12 1920, and C&A 1 - 1930 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

As noted in Locobase 9086, Baldwin supplied 50 Moguls to the Alton in 1899-1900. 35 were completed to a simple-expansion, 20' x 28" cylinder design. The 15 delivered in 1900 (June - 17828-17829, 17849-17850, 17874, 17894, 17896-17897; July - 17946-17947; and September - 18123-18124, 18197-18199) came on the road as Vauclain compounds. That setup did not endure and the entire batch was converted to simple expansion and had the same specfications as the F3s shown in Locobase 9086.

Class F4 / K-19 (Locobase 9088)

Data from C&A 6 - 1918, C&A 12 1920, and C&A 1 - 1930 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers ran 20302-

20303 (April 1902), 22452-22453, 22529-22558 (July 1903), 22714 (August 1903, 22972 (October 1903).

These were enlargements of the F3s (Locobase 9086-9087) that were actually quite big.

The whole class was taken into the Baltimore & Ohio except for 362 and all were scrapped in August-September 1933.

Class F7 / K-20 (Locobase 9089)

Data from C&A 6 - 1918, C&A 12 1920, and C&A 1 - 1930 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. All were produced in December 1910 with works numbers 35664-35667, 35711-35714 , 35767-35768.

These small Moguls had a short wheelbase and small drivers, a design that seems optimized for tight curving alignments where pulling power was a key value. Drury (1993) suggests they were used for tranfer and switching work.

The whole class was taken into the Baltimore & Ohio except for 362 and all were scrapped in 1936.

Specifications
Class	F3 / K-18	F3a	F4 / K-19	F7 / K-20
Locobase ID	9086	9087	9088	9089
Railroad	Chicago & Alton	Chicago & Alton	Chicago & Alton	Chicago & Alton
Whyte	2-6-0	2-6-0	2-6-0	2-6-0
Road Numbers	300-349 / 240-242	335-349	360-367 / 2423-2429	390-399 / 2430-2439
Gauge	Std	Std	Std	Std
Builder	Burnham, Williams & Co	Burnham, Williams & Co	Burnham, Williams & Co	Baldwin
Year	1899	1900	1902	1910
Valve Gear	Stephenson	Stephenson	Stephenson	Stephenson
	Locomotive Length and Weight
Driver Wheelbase	15'	15'	16'	11.17'
Engine Wheelbase	23.42'	23.42'	24.67'	19.75'
Ratio of driving wheelbase to overall engine wheebase	0.64	0.64	0.65	0.57
Overall Wheelbase (engine & tender)	53.21'	53.21'	52.71'	51.31'
Axle Loading (Maximum Weight per Axle)	47310 lbs		50200 lbs	48500 lbs
Weight on Drivers	140930 lbs	140930 lbs	142000 lbs	142200 lbs
Engine Weight	159800 lbs	159800 lbs	163000 lbs	162000 lbs
Tender Light Weight	103700 lbs	103700 lbs	120800 lbs	132000 lbs
Total Engine and Tender Weight	263500 lbs	263500 lbs	283800 lbs	294000 lbs
Tender Water Capacity	5000 gals	5000 gals	6000 gals	8000 gals
Tender Fuel Capacity (oil/coal)	10.5 tons	10.5 tons	12 tons	10 tons
Minimum weight per yard of rail on which locomotive could run	78.29 lb rail	78.29 lb rail	78.89 lb rail	79 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	62"	62"	62"	51"
Boiler Pressure	200 psi	200 psi	200 psi	190 psi
Cylinders (dia x stroke)	20" x 28"	15.5" x 28"	20" x 28"	21" x 26"
Tractive Effort	30710 lbs	26647 lbs	30710 lbs	36309 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.59	5.29	4.62	3.92
	Heating Ability
Firebox Area	192 sq. ft	192 sq. ft	157.50 sq. ft	163.70 sq. ft
Grate Area	33.80 sq. ft	33.80 sq. ft	48 sq. ft	30.18 sq. ft
Evaporative Heating Surface	2154	2154	2608	1936
Superheating Surface
Combined Heating Surface	2154	2154	2608	1936
Evaporative Heating Surface/Cylinder Volume	211.57	352.25	256.16	185.75
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	6760	6760	9600	5734.20
Same as above plus superheater percentage	6760	6760	9600	5734.20
Same as above but substitute firebox area for grate area	38400	38400	31500	31103
Power L1	6321.13	4045.52	6892.55	4268.03
Power MT	296.65	189.86	321.03	198.51