These five members of the large Cooke class of Eight-wheelers delivered in 1885 were rebuilt by the CGW in 1904 and 1908. Most of the engines gained another decade or so of additional service.
These Eight-wheelers were small and numerous, a very large class for the time.
Jerry L. Huddleston explains, on http://www.trainweb.org/cgw/history-bin/about_the%20cgw.html (visited 11 August 2004), that the M&NW was the 110-mile predecessor of the Chicago Great Western that opened in 1885 by the "imaginative and energetic Minnesotan, A.B. Stickney". Stickney soon extended the M&NW to Kansas City and Chicago. Two years later, he merged the M & NW with the Chicago, St Paul, & Kansas City (CStPKC), which he also owned. Finally, Stickney merged the CStP&KC with the CGW in 1892.
As for this class, Locobase believes that the following breathless description refers to this class:
"There are no finer looking or better working locomotives running out of St Paul than the new passenger engines of the Minnesota & Northwestern,."
The article tells us that general master mechanic T W Heintzelman intended these engines "to run fast heavy passenger trains on time over a road having heavy grades, and accordingly they have been made large to suit the work They stand high in the frames, but they ride very steady even at the highest speeds."
Large indeed--this class had some of the largest boilers on an Eight-wheeler in the decade of the 1880s.
Unfortunately, the account doesn't include any heating surfaces, although it does supply the tube count and diameter.
There are plenty of clues, however, to point us toward what would later be called the C11s. The report says the engines were built in Paterson. It credits them with 19" cylinders, 256 tubes, and weights somewhat lower than the ones shown in the 1917 diagram.
Locobase cannot match up this class to any entry in the compilation of Cooke locomotives by B.Rumary (25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND) and supplied to Locobase by Allen Stanley in March 2004.
According to a compilation of Cooke locomotives by B.Rumary (25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND) and supplied to Locobase by Allen Stanley in March 2004, works numbers were 1939-1943 (November 1888). Four years later the CStP&KC would be merged with the Chicago Great Western.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Chicago Great Western (CGW)||Minnesota & Northwestern (CGW)||Minnesota & Northwestern (CGW)||Chicago Saint Paul & Kansas City (CGW)||Chicago Saint Paul & Kansas City (CGW)|
|Number in Class||5||48||6||6||5|
|Road Numbers||33-34, 37-39||13-36, 41-48, 55-70||49-54/90-95||81, 84, 85||111-115 / 66|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.37||0.37||0.35||0.38||0.37|
|Overall Wheelbase (engine & tender)||45.50'||48.54'||51.01'||46.48'||48.54'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||62500 lbs||55000 lbs||73600 lbs||69900 lbs||62000 lbs|
|Engine Weight||100500 lbs||85300 lbs||117300 lbs||108600 lbs||96000 lbs|
|Tender Light Weight||71000 lbs||68000 lbs||89100 lbs||89100 lbs||86350 lbs|
|Total Engine and Tender Weight||171500 lbs||153300 lbs||206400 lbs||197700 lbs||182350 lbs|
|Tender Water Capacity||3500 gals||3000 gals||5000 gals||4000 gals||4000 gals|
|Tender Fuel Capacity (oil/coal)||8 tons||8 tons||tons||11 tons||7 tons|
|Minimum weight of rail (calculated)||52 lb/yard||46 lb/yard||61 lb/yard||58 lb/yard||52 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||160 psi||145 psi||170 psi||155 psi||155 psi|
|Cylinders (dia x stroke)||17" x 24"||17" x 24"||19" x 24"||19" x 24"||17" x 24"|
|Tractive Effort||14973 lbs||13569 lbs||18411 lbs||16787 lbs||14505 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.17||4.05||4.00||4.16||4.27|
|Firebox Area||126 sq. ft||111.75 sq. ft||141.53 sq. ft||135.40 sq. ft||113.50 sq. ft|
|Grate Area||16.43 sq. ft||17 sq. ft||20.50 sq. ft||17 sq. ft||20.90 sq. ft|
|Evaporative Heating Surface||1390 sq. ft||1062 sq. ft||1775 sq. ft||1745 sq. ft||1415 sq. ft|
|Combined Heating Surface||1390 sq. ft||1062 sq. ft||1775 sq. ft||1745 sq. ft||1415 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||220.46||168.44||225.37||221.56||224.42|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||2629||2465||3485||2635||3240|
|Same as above plus superheater percentage||2629||2465||3485||2635||3240|
|Same as above but substitute firebox area for grate area||20160||16204||24060||20987||17593|