Duluth, Missabe & Northern 2-10-2 "Santafe" Locomotives of the USA

The first "Santa Fe" type locomotives to arrive on the Duluth, Missabe & Northern Railway were six which were built by the Baldwin Locomotive works and delivered in 1916. They were designated as Class E and were given road numbers 500 through 505. These locomotives had 60" diameter drivers, 28" x 32" cylinders, a 188.5 psi boiler pressure, they exerted 66,995 pounds of tractive effort and each weighed 346,600 pounds. These locomotives

Later modifications included replacing the original Hodge truck with a delta trailing truck. Adding Cylinder "Snifter" valves, Elesco feedwater heater atop the smoke box, side mounted feedwater pump, and boiler top mountings for the air reservoirs plus a new slant front cab.

In 1919, the USRA allocated ten "Santa Fe-Light" locomotives to the DM&N. These locomotives were built by the American Locomotive Company and were designated as Class E-1 with road numbers 506 through 515 assigned. They had 57" diameter drivers, 27" x 32" cylinders, a 200 psi boiler pressure, they exerted 69,575 pounds of tractive effort and each weighed 352,300 pounds.

There are two surviving DM&N 2-10-2 "Santa Fe" type locomotive. One is number 502 and it is on display at the Museum of Transportation in St. Louis, MO. The other is number 506, which was later DM&IR number 506. It is displayed at the National Railroad Museum in Green Bay, WI.

Roster by Richard Duley

ClassQty.Road NumbersYear BuiltBuilderNotes
E 6500-5051916BaldwinNumber 502 is preserved Numbers 500, 501 & 503-505 scrapped between 1959 and 1962.
E-110506-5151919ALCOUSRA allocated .Santa Fe-Light. locomotives. Number 506 is preserved. Numbers 507-515 scrapped between 1959 and 1963.

Class Details by Steve Llanso of Sweat House Media

Class E (Locobase 456)

Data from DeGolyer, Volume55, pp. 157+. See also "Heavy Freight Locomotives, Duluth, Missabe & Northern Ry." Railway Review, Volume 59 (7 October 1916), pp. 475-476. (Thanks to Chris Hohl for his 29 April 2015 email pointing out an error in the boiler pressure.) Works numbers were 43409-43412 in May 1916 and 43501-43502 in June.

These were the first Santa Fe types to operate on the DM&N. Firebox heating surface included 90 sq ft (8.35 sq m) in the combustion chamber and 32.5 sq ft (3 sq m) in four arch tubes. Fourteen-inch (356 mm) piston valves supplied steam to the cylinders. The greater power supplied by these engines over the Consolidations then in use is signified by the train sizes, which more than doubled from 65 loaded cars to 135.

The class went through a major revamping of the steam-generating system; the result is shown in Locobase 14581.

Class E with syphons (Locobase 14581)

Data from DM&IR 1 - 1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Some of the E class Santa Fes described in Locobases 456 and 1346 were later retrofitted with Nicholson thermic syphons, which entailed deletion of four small tubes and raised the direct heating surface area from an already substantial 8.1% of the evaporative heating surface to 454 sq ft (42.2 sq m) or 9.8% of 4,622 sq ft (429.4 sq m) of EHS. All of the engines received feed water heaters of three different makes: 500 was fitted with the Coffin's "horsecollar", 501-504 took Elescos, and 505 used a Worthington. these makeovers led to appreciable weight gain of 10 tons on the drivers (to 296,760 lb/134,608 kg) and 15 tons overall (376,710 lb/170,873 kg).

The grate area remained unchanged as were the cylinders, which still used fourteen-inch (356 mm) piston valves.

Like most of the DM&N and Duluth & Iron Range motive power stud, the Es operated into the late 1950s. 501 was scrapped in 1959, 500 and 503-505 in 1962. 502 was preserved for display at the National Museum of Transportation in Kirkwood, Mo.

Class E-1 (Locobase 1346)

Data from DM&IR 6 -1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

USRA light Santa Fe. The design was criticized elsewhere because its small drivers frustrated efforts at counterbalancing masses for smooth riding and whose light weight limited adhesion. Drury (1993) observes that the DM&N's 35-mph speed limit kept the counterbalancing problem at bay and that the design was in any case a better one than the earlier E class. The diagram shows that all but two of this class (512, 514) eventually had Nicholson thermic syphons.

Operated until 1959-1963.

Specifications by Steve Llanso of Sweat House Media
ClassEE with syphonsE-1
Locobase ID456 14581 1346
RailroadDuluth, Missabe & Northern (DM&IR)Duluth, Missabe & Northern (DM&IR)Duluth, Missabe & Northern (DM&IR)
Number in Class6610
Road Numbers500-505500-505506-515
Number Built610
Valve GearWalschaertWalschaertSouthern
Locomotive Length and Weight
Driver Wheelbase20.83'20.83'21'
Engine Wheelbase39.83'39.83'40.30'
Ratio of driving wheelbase to overall engine wheebase 0.52 0.52 0.52
Overall Wheelbase (engine & tender)72.56'72.56'75.97'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers275000 lbs296760 lbs274000 lbs
Engine Weight342000 lbs376710 lbs352000 lbs
Tender Light Weight190400 lbs234400 lbs227360 lbs
Total Engine and Tender Weight532400 lbs611110 lbs579360 lbs
Tender Water Capacity9000 gals12000 gals10000 gals
Tender Fuel Capacity (oil/coal)18 tons21 tons16 tons
Minimum weight of rail (calculated)92 lb/yard99 lb/yard91 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter60"60"57"
Boiler Pressure185 psi188.50 psi200 psi
Cylinders (dia x stroke)28" x 32"28" x 32"27" x 32"
Tractive Effort65751 lbs66995 lbs69575 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.18 4.43 3.94
Heating Ability
Firebox Area372.50 sq. ft454 sq. ft475 sq. ft
Grate Area80 sq. ft80 sq. ft76.30 sq. ft
Evaporative Heating Surface4588 sq. ft4622 sq. ft4642 sq. ft
Superheating Surface1128 sq. ft1130 sq. ft1085 sq. ft
Combined Heating Surface5716 sq. ft5752 sq. ft5727 sq. ft
Evaporative Heating Surface/Cylinder Volume201.18202.67218.90
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation148001508015260
Same as above plus superheater percentage177601809618159
Same as above but substitute firebox area for grate area82695102695113050
Power L1134681410315036
Power MT539.85523.85604.90



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