Rock Island 2-10-2 "Santa Fe" Type Locomotives

Class N-83 (Locobase 7234)

Data from RI to 1951 Combined Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Firebox had 116.7 sq ft of thermic syphons in these Santa Fes. The locomotives arrived in two batches -- 3001-3010 in 1918, 3011-3025 in 1920.

Drury's (1993) assessment: "Even with 63" drivers, [they] had counterbalancing problems and were limited to 30 mph." Later refitting with disk drivers ameliorated the pounding.

Class N-83 (Locobase 77)

Data from 1930 Locomotive Cyclopedia, supplemented by RI to 1951 Combined Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

These were the last 10 of the 35 Santa Fes delivered to the Rock Island and manifested an increase in superheater area; the first 25 are described in Locobase 7234. The firebox had 121 sq ft of thermic syphons and some of the boilers had feedwater heater (Four had Worthington BLs and three had Elescos). Three more had exhaust steam injectors. The diagrams show a superheater area of 1,350 sq ft vs the number from the Locomotive Cyclopedia. In any case, the tubes and flues were 1 ft 10" longer than those of the first group.

Drury's (1993) assessment: "Even with 63" drivers, [they] had counterbalancing problems and were limited to 30 mph." Later refitting with disk drivers ameliorated the pounding.

Specifications
Class	N-83	N-83
Locobase ID	7234	77
Railroad	Rock Island (CRI & P)	Rock Island (CRI & P)
Whyte	2-10-2	2-10-2
Road Numbers	3001-3025	3026-3035
Gauge	Std	Std
Builder	Alco-Brooks	Alco-Schenectady
Year	1918	1925
Valve Gear	Baker	Baker
	Locomotive Length and Weight
Driver Wheelbase	22.50'	22.50'
Engine Wheelbase	41.25'	42.60'
Ratio of driving wheelbase to overall engine wheebase	0.55	0.53
Overall Wheelbase (engine & tender)	80.23'	82.67'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers	304300 lbs	317500 lbs
Engine Weight	385400 lbs	405000 lbs
Tender Light Weight	207100 lbs	223600 lbs
Total Engine and Tender Weight	592500 lbs	628600 lbs
Tender Water Capacity	10000 gals	12000 gals
Tender Fuel Capacity (oil/coal)	4550 gals	18 tons
Minimum weight per yard of rail on which locomotive could run	101 lb rail	106 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	63"	63"
Boiler Pressure	215 psi	215 psi
Cylinders (dia x stroke)	30" x 32"	30" x 32"
Tractive Effort	83543 lbs	83543 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	3.64	3.80
	Heating Ability
Firebox Area	448.20 sq. ft	445 sq. ft
Grate Area	80.30 sq. ft	80.30 sq. ft
Evaporative Heating Surface	4741	4940
Superheating Surface	1150	1424
Combined Heating Surface	5891	6364
Evaporative Heating Surface/Cylinder Volume	181.09	188.69
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	17265	17265
Same as above plus superheater percentage	20717	20717
Same as above but substitute firebox area for grate area	115636	114810
Power L1	14945	17230
Power MT	541.37	598.20