Duluth, Missabe & Northern 2-10-2 "Santa Fe" Locomotives in the USA

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, and his 7 September 2018 email correcting the tender's water capacity.) 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 Rail Data Exchange.

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 Rail Data Exchange.

USRA light Santa Fe (Locobase 231). 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 (56.5 kph) 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.