Chicago & Illinois Midland 2-10-2 "Santa Fe" Locomotives in the USA

Class G-1/G-2 (Locobase 3170)

Data from C&IM 4 - 1954 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. (Thanks to Chris Hohl for his 28 March 2016 email and spreadsheet showing the different tender sizes and capacities.) See also DeGolyer, Volume 77, pp.738+. Works numbers were 60245-60246 in October 1927 and 61025-61026 in September 1929.

Compared to other 2-10-2s of the era, these were low-drivered, coal train engines. Steam supply was adequate and, given the speeds, the 14" (356 mm) piston valves probably did the job as well. A "Hereafter" note in the first pair's specs, however, suggested raising the possibility of increasing valve travel from 6 3/4" (127 mm) to 7" (179 mm). For whatever reason, the second pair's valve travel remained at 6 3/4".

110 sq ft (10.2 sq m) in the combustion chamber, 96 sq ft (8.9 sq m) in three thermic syphons (two in the firebox, one in the combustion chamber), and 20 sq ft (1.85 sq m) of three arch tubes contributed to the firebox's heating surface. Although the cylinders were designed with a feedwater heater in mind, Locobase cannot determine if one was ever installed. They were not part of the locomotive in the 1954 diagrams.

Apparently, Baldwin was uncharacteristically pessimistic about locomotive weights in its 1927 specs. Adhesion weight was estimated to be 290,000 lb (131,542 kg) and loaded engine weight 377,500 lb (171,231 kg) . The second pair's 1929 estimates were 278,000 lb (126,099 kg) and 360,300 lb (138,936 kg), much closer to the railroad's figures.

As delivered, the 600-601 trailed tenders carrying 10,000 US gallons (37,850 litres) of water and 16 tons of coal. Water capacity in the 602-603's tenders increased to the 12,000 gallons shown in the specs. By the end of steam, tender coal capacity had grown to 20 tons in all but 602; loaded weight now came in at 220,300 lb (99,927 kg).

Locobase 76 shows the Lima Super Santa Fes of 1931. Like those engines, all of the Baldwins served until the end of steam. 601 retired in August and the others on 31 December 1955.

Class H-1 (Locobase 76)

Data from tables in 1930 Locomotive Cyclopedia and C&IM 4 1954 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 .Hohl's 5 July 2020 email reported a smaller tender capacity based on the 1938 Locomotive Cyclopedia.) Works numbers were 7572-7573 in February 1931 and 7584-7585 in April.

These were bigger Santa Fes than the 1927 Baldwins (Locobase 3170) and filled out the Chicago & Illinois Midland's 2-10-2 stud. Embracing the "power at speed" superpower formula advanced by the Ohio builder, the design had 15" (381 mm) piston valves to serve the big cylinders, 142 sq ft (13.2 sq m) of arch tubes and thermic syphons to add to the firebox and combustion chamber heating surface, and taller drivers for faster running. Starting power included a 11,500 lb (5,216 kg or 51,15 kN).

Delivered with small tenders carrying 12,000 US gallons (45,420 litres) of water and 16 tons (14.5 metric tons) of coal, the class later trailed the much larger tenders shown in Locobase's specs.

Like the others, they ran until the end of steam in drag-freight service before retiring in December 1955.