Rock Island 2-10-2 "Santafe" Locomotives of the USA

The Chicago, Rock Island & Pacific Railroad took delivery of ten "Santa Fe" type locomotives in 1918. These locomotives were built by the American Locomotive Company and were designated as Class N-78 and assigned road numbers 3001 through 3010. Fifteen more ALCO-built 2-10-2s were added to the roster in 1920. This group was also designate as Class N-78 and carried road numbers 3011 through 3025.

All twenty-five of these Class N-78s were coal fired and had 63" diameter drivers, 30" x 32" cylinders, a 200 psi boiler pressure, they exerted 77,715 pounds of tractive effort and each weighed 385,400 pounds. Their firebox had 116.7 square feet of thermic syphons.

In 1925, another group of ALCO-built "Santa Fes" was added to the roster. These locomotives were oil-fired and were also classified as Class N-78. They had 63" diameter drivers, 30" x 32" cylinders, a 200 psi boiler pressure, they exerted 77,715 pounds of tractive effort and each weighed 405,000 pounds. The firebox had 121 sq ft of thermic syphons and some of the boilers had feedwater heater,

All thirty-five of the CRIP's "Santa Fes" as delivered had counterbalancing problems and were limited to 30 mph. Refitting them with disk drivers reduced the problem and reducing the pounding.

There are no surviving CRIP 2-10-2 "Santa Fe" type locomotives.


Roster by Richard Duley

ClassQty.Road NumbersYear BuiltBuilderNotes
N-78103001-30101918ALCONumbers 3001-3010 scrapped between 1939 and 1952.
N-78153011-30251920ALCONumbers 3011-3025 scrapped between 1939 and 1952.
N-78103026-30351925ALCONumbers 3026-3035 scrapped between 1939 and 1952.

Class Details by Steve Llanso of Sweat House Media

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 Raildata 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.


Class N-83 (Locobase 7234)

Data from RI1 -1942 and RI to 1951 Combined Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Brooks produced the locomotives in two batches -- 3001-3010 in 1918, 3011-3025 in 1920.

The later addition of 116.7 sq ft (10.85 sq m) of thermic syphons in place of the original 36 sq ft (3.35 sq m) of arch tubes in these Santa Fes brought the firebox heating surface up to 448.2 sq ft (41.65 sq m).

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 by Steve Llanso of Sweat House Media
ClassN-83N-83
Locobase ID77 7234
RailroadRock Island (CRI & P)Rock Island (CRI & P)
CountryUSAUSA
Whyte2-10-22-10-2
Number in Class1025
Road Numbers3026-30353001-3025
GaugeStdStd
Number Built1025
BuilderAlco-SchenectadyAlco-Brooks
Year19251918
Valve GearBakerBaker
Locomotive Length and Weight
Driver Wheelbase22.50'22.50'
Engine Wheelbase42.60'41.25'
Ratio of driving wheelbase to overall engine wheebase 0.53 0.55
Overall Wheelbase (engine & tender)82.67'80.23'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers317500 lbs304300 lbs
Engine Weight405000 lbs385400 lbs
Tender Light Weight223600 lbs207100 lbs
Total Engine and Tender Weight628600 lbs592500 lbs
Tender Water Capacity12000 gals10000 gals
Tender Fuel Capacity (oil/coal)18 tons4550 gals
Minimum weight of rail (calculated)106 lb/yard101 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"63"
Boiler Pressure215 psi215 psi
Cylinders (dia x stroke)30" x 32"30" x 32"
Tractive Effort83543 lbs83543 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.80 3.64
Heating Ability
Firebox Area445 sq. ft385.30 sq. ft
Grate Area80.30 sq. ft80.30 sq. ft
Evaporative Heating Surface4940 sq. ft4668 sq. ft
Superheating Surface1424 sq. ft1150 sq. ft
Combined Heating Surface6364 sq. ft5818 sq. ft
Evaporative Heating Surface/Cylinder Volume188.69178.30
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1726517265
Same as above plus superheater percentage2106320717
Same as above but substitute firebox area for grate area11672499407
Power L11723014611
Power MT598.20529.28

Photos

Reference


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