Class 10 (Locobase 7224)

Data from RI to 1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 41, pp. 151+. Works numbers were 36101-36102 in February 1911.

The boilers of these low-drivered Moguls were built to American Locomotive specifications originally used with the 1910 Chicago & Alton F7 2-6-0s described in Locobase 9089 and also built by Baldwin. As in its earlier F7 order, the specification stated that the Alco drawing 139-S-4990 could be "modified in dimensions to suit specifications", but was to be followed with regard to the fire door, position of the 610 Tate flexible stay bolts, mud ring section, pocket flues (one in front flue sheet, two in the back flue sheet), check [valve] position, and any "changes in red".

The pair had relatively large 14" (356 mm) piston valves to serve capacious cylinders. Firebox heating surface area was originally specified as 159 sq ft (14.77 sq m) and evaporative heating surface area amounted to 1,919 sq ft (178.28 sq m), but a 1 April 1913 note changed the values to those t shown in Locobase. The Rock Island's diagram restored the 159 sq ft measurement. There's no mention of an arch tube in the spec.

A 3 July 1913 letter from "HAFC" apparently reported one or more bent "back rod" incidents, probably referring to the side rods connecting the second and third driving axles as it prompted a "Hereafter" caution: "Back rod strengthened as Tracing 24.512 ....re-design rods so as to eliminate side set possible". Locobase suspects "side set" refers to a misalignment that caused the back rod to be stressed from an angle rather than end on.

Locobase doesn't know what service the 10 and 11 performed, but suspects it was transfer freight operations in the Peoria area.

Less than 25 years later (on 3 May 1935) the class was declared "obsolete", which is sad-sounding, somehow.

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Class G-19/5 (Locobase 7191)

Data from RI 11 - 1903 Locomotive Class & Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 1439-1446 in October 1888; 1545-1458 in November, 1469-1474 in December, 1483-1492 in January 1889, 1498-1510 in February.

Apparently the Rock Island didn't indulge itself in operating Moguls as this seems to be the only class of any size that used that wheel arrangement.