Rock Island 2-10-2 "Santafe" Locomotives in 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-72 (Locobase 16315)

Data from "Rock Island 2-10-2 Locomotive", Railway Mechanical Engineer, Volume 93, No 1 (January 1919), pp. 41-43. (Thanks to Chris Hohl for his 6 October 2017 email noting the original specifications and pointing Locobase to the 1919 journal report that supllied the correct data.) Brooks produced the locomotives in two batches -- 3001-3010 (works numbers were 58305-58314 in May 1918) and 3011-3025 (works numbers were 62162-62176 in October 1920.

As delivered, firebox heating surface area included 36 sq ft (3.35 sq m) of arch tubes. Fourteen-inch (381 mm) piston valves actuated by outside radial valve gear admitted steam to the cylinders.

Drury's (1993) assessment: "Even with 63" drivers, [they] had counterbalancing problems and were limited to 30 mph." Not long after they entered service, the class's boiler pressure was increased to 200 psi (13.8 bar). Later refitting with disk drivers ameliorated the pounding and more direct heating surface and a stil higher boiler pressure increased power even more; See Locobase 7234.


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 Rail Data Exchange. (Many thanks to Chris Hohl for his 22 September 2017 email reporting unlikely boiler pressure values for 177 entries. A Locobase macro caused the error .)

These were the last ten of the 35 Santa Fes delivered to the Rock Island and manifested an increase in superheater area; the first 25 are described in Locobase 20278. 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" (559 mm) 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 Rail Data Exchange.

Locobase 16315shows the original set of 25 Santa Fes as they arrived on the Rock Island in 1918. 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 that "Even with 63" drivers, [they] had counterbalancing problems and were limited to 30 mph." led to refitting with disk drivers that ameliorated the pounding.

The largest-capacity oil tender is shown in the Locobase specs. Those retained as coal burners eventually trailed the heaviest tenders, which weighed 241,000 lb (109,316 kg) when carrying 14,000 US gallons (52,990 litres) of water and 18 tons (16.4 metric tons) of coal and brought the full power system weight of engine and tender to 632,000 lb (286,670 kg).

Principal Dimensions by Steve Llanso of Sweat House Media
ClassN-72N-83N-83
Locobase ID16,315 77 7234
RailroadRock Island (CRI & P)Rock Island (CRI & P)Rock Island (CRI & P)
CountryUSAUSAUSA
Whyte2-10-22-10-22-10-2
Number in Class251025
Road Numbers3001-30253026-30353001-3025
GaugeStdStdStd
Number Built251025
BuilderAlco-BrooksAlco-SchenectadyAlco-Brooks
Year191819251918
Valve GearBakerBakerBaker
Locomotive Length and Weight
Driver Wheelbase (ft / m)22.50 / 6.8622.50 / 6.8622.50 / 6.86
Engine Wheelbase (ft / m)41.25 / 12.5742.60 / 12.9841.25 / 12.57
Ratio of driving wheelbase to overall engine wheebase 0.55 0.53 0.55
Overall Wheelbase (engine & tender) (ft / m)80.23 / 24.4582.67 / 25.2080.23 / 24.45
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)302,500 / 137,212317,500 / 144,016304,300 / 138,028
Engine Weight (lbs / kg)383,000 / 173,726405,000 / 183,705385,400 / 174,815
Tender Loaded Weight (lbs / kg)189,900 / 86,137223,600 / 101,423207,100 / 93,939
Total Engine and Tender Weight (lbs / kg)572,900 / 259,863628,600 / 285,128592,500 / 268,754
Tender Water Capacity (gals / ML)10,000 / 37.8812,000 / 45.4510,000 / 37.88
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)16 / 14.5018 / 16.404550 / 17.20
Minimum weight of rail (calculated) (lb/yd / kg/m)101 / 50.50106 / 53101 / 50.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 160063 / 160063 / 1600
Boiler Pressure (psi / kPa)185 / 12.80215 / 14.80215 / 14.80
High Pressure Cylinders (dia x stroke) (in / mm)30" x 32" / 762x81330" x 32" / 762x81330" x 32" / 762x813
Tractive Effort (lbs / kg)71,886 / 32606.9883,543 / 37894.5183,543 / 37894.51
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.21 3.80 3.64
Heating Ability
Firebox Area (sq ft / m2)391 / 36.32445 / 41.34458.20 / 41.66
Grate Area (sq ft / m2)80.20 / 7.4580.30 / 7.4680.30 / 7.46
Evaporative Heating Surface (sq ft / m2)4608 / 428.094940 / 459.114741 / 440.45
Superheating Surface (sq ft / m2)1180 / 109.621424 / 132.341150 / 106.84
Combined Heating Surface (sq ft / m2)5788 / 537.716364 / 591.455891 / 547.29
Evaporative Heating Surface/Cylinder Volume176.01188.69181.09
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14,83717,26517,265
Same as above plus superheater percentage17,80421,06320,717
Same as above but substitute firebox area for grate area86,802116,724118,216
Power L112,74917,23014,989
Power MT464.57598.20542.97

Photos

Reference