St L, I M & S / Missouri Pacific 2-10-2 "Santa Fe" Type Locomotives

Class SF-63 (Locobase 80)

Firebox had thermic syphon, boiler had feedwater heater. 2-10-2s were rare on the MoPac and most operated in hump service at classification yards. Such were the power demands during World War II, however, that the railroad rebuilt this 10-engine class with and lightweight main and side rods, roller bearings on the axles, a trailing-truck booster engine and a larger tender and put them back out on the road. The last was retired in 1955.

Class SF-63 (Locobase 5437)

Data from table in January 1917 issue of Railway Mechanical Engineer (RME).

The Iron Mountain system (St Louis, Iron Mountain & Southern) -- itself an accumulator of smaller lines in the previous decade -- bought these engines while in the receivership that would lead, in May 1917, to its being absorbed by the Missouri Pacific. These Santa Fes were large beasts with long boilers over long wheelbases. It's interesting to see the relative sparseness of the tube and flue layout and it's rare to find so square a ratio between piston diameter and stroke. These engines may have been short of steam.

Whatever their assets and limitations, the class clearly fulfilled a need and the last didn't leave the MoPac until 1953.

Specifications
Class	SF-63	SF-63
Locobase ID	80	5437
Railroad	Missouri Pacific (MP)	St L, I M & S (MP)
Whyte	2-10-2	2-10-2
Road Numbers	1720-1729	1501-1514/1701-1714
Gauge	Std	Std
Builder	Baldwin	Alco-Brooks
Year	1926	1916
Valve Gear		Walschaert
	Locomotive Length and Weight
Driver Wheelbase	22.50'	22.50'
Engine Wheelbase	42.60'	41.83'
Ratio of driving wheelbase to overall engine wheebase	0.53	0.54
Overall Wheelbase (engine & tender)	83.54'	78.85'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers	326080 lbs	294500 lbs
Engine Weight	420650 lbs	370000 lbs
Tender Light Weight		190300 lbs
Total Engine and Tender Weight	0	560300 lbs
Tender Water Capacity	12000 gals	10000 gals
Tender Fuel Capacity (oil/coal)	16 tons	16 tons
Minimum weight per yard of rail on which locomotive could run	109 lb rail	98 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	63"	63"
Boiler Pressure	210 psi	188.50 psi
Cylinders (dia x stroke)	30" x 32"	30" x 30"
Tractive Effort	81600 lbs	68668 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.00	4.29
	Heating Ability
Firebox Area	483 sq. ft	400 sq. ft
Grate Area	88.40 sq. ft	80.30 sq. ft
Evaporative Heating Surface	5080	4617
Superheating Surface	1270	1170
Combined Heating Surface	6350	5787
Evaporative Heating Surface/Cylinder Volume	194.04	188.11
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	18564	15137
Same as above plus superheater percentage	22277	18164
Same as above but substitute firebox area for grate area	121716	90480
Power L1	15940	13828
Power MT	538.85	517.58