Pere Marquette 2-10-2 "Santafe" Locomotives of the USA

The Pere Marquette Railway bought fifteen "Santa Fe" type locomotives from the American Locomotive Company in 1918. The locomotives were designated as Class SF and carried road numbers 1101 through 1113. They had 64" diameter drivers, 29" x 32" cylinders, a 210 psi boiler pressure and they exerted 77,059 pounds of tractive effort and each weighed 398,000 pounds.

These 2-10-2s were conveyed to the C&O in 1947 and were renumbered with C&O numbers 2975 through 2989. At 324,000 pounds they were among the lightest and had a relatively small boiler and cylinder size. The fire box heating surface was good size and it had 89 square feet of thermic siphons and 19.5 square feet of arch tubes. Also of note were the leading and trailing wheels, at 33" in diameter they about 10 inches smaller most in use.

In 1920, the Pere Marquette bought two second hand "Santa Fe" type locomotives from the Hocking Valley Railroad.

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

Roster by Richard Duley

ClassQty.Road NumbersFrom Other RRYear AcquiredYear BuiltBuilderNotes
SF151101-11151918ALCONumbers 1101-1115 became C&O numbers 2975-2989 and scrapped between 1949 and 1952.
SF-6 21198-1199Hocking Valley19301919BaldwinNumber 1198 & 1199 bought from the Hocking Valley in 1930. They were HV numbers 141 & 143. Became C&O 2960 & 2961 and scrapped in 1949.

Class Details by Steve Llanso of Sweat House Media

Class SF (Locobase 478)

One source (C&O Power) doesn't give superheater area, but data from PM 5 - 1929 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection does. Cylinder horsepower calculated to be 2,434. Built by Alco's Brooks works.

Passed along to the C&O after the 1947 merger and renumbered 2975-2989. Among the lightest Santa Fes in service in any US railroad with the smallest boiler and relatively modest cylinder dimensions. Firebox heating surface was generous and included 89 sq ft of thermic syphons and 19.5 sq ft of arch tubes.

The Pere Marquette Historical Society website page, last accessed 8 March 2008, shows a William R Dewey photo of 1108 and makes the following observation: "Most notable when looking at them broadside were the 33-inch pilot and trailing wheels, which were a good ten inches smaller than most 2-10-2s' of the day." Another feature of note was the sand dome over the first axle, which was tall and drum-like.

Specifications by Steve Llanso of Sweat House Media
Locobase ID478
RailroadPere Marquette (PM)
Number in Class15
Road Numbers1101-1115
Number Built15
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase20.50'
Engine Wheelbase47.58'
Ratio of driving wheelbase to overall engine wheebase 0.43
Overall Wheelbase (engine & tender)90.33'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers264930 lbs
Engine Weight324000 lbs
Tender Light Weight224100 lbs
Total Engine and Tender Weight548100 lbs
Tender Water Capacity16000 gals
Tender Fuel Capacity (oil/coal)20 tons
Minimum weight of rail (calculated)88 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"
Boiler Pressure200 psi
Cylinders (dia x stroke)26" x 32"
Tractive Effort64516 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.11
Heating Ability
Firebox Area394.50 sq. ft
Grate Area66.70 sq. ft
Evaporative Heating Surface3504 sq. ft
Superheating Surface835 sq. ft
Combined Heating Surface4339 sq. ft
Evaporative Heating Surface/Cylinder Volume178.19
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation13340
Same as above plus superheater percentage15875
Same as above but substitute firebox area for grate area93891
Power L112553
Power MT522.30



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