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.
|Principal Dimensions 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|
|Driver Wheelbase (ft / m)||8.50 / 2.59||8.50 / 2.59||8.50 / 2.59||9.09 / 2.77||8.50 / 2.59|
|Engine Wheelbase (ft / m)||23.10 / 7.04||23.10 / 7.04||24 / 7.32||24.04 / 7.33||23.10 / 7.04|
|Ratio of driving wheelbase to overall engine wheebase||0.37||0.37||0.35||0.38||0.37|
|Overall Wheelbase (engine & tender) (ft / m)||45.50 / 13.87||48.54 / 14.79||51.01 / 15.55||46.48 / 14.17||48.54 / 14.79|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||62,500 / 28,350||55,000 / 24,948||73,600 / 33,384||69,900 / 31,706||62,000 / 28,123|
|Engine Weight (lbs / kg)||100,500 / 45,586||85,300 / 38,691||117,300 / 53,206||108,600 / 49,260||96,000 / 43,545|
|Tender Loaded Weight (lbs / kg)||71,000 / 32,205||68,000 / 30,844||89,100 / 40,415||89,100 / 40,415||86,350 / 39,168|
|Total Engine and Tender Weight (lbs / kg)||171,500 / 77,791||153,300 / 69,535||206,400 / 93,621||197,700 / 89,675||182,350 / 82,713|
|Tender Water Capacity (gals / ML)||3500 / 13.26||3000 / 11.36||5000 / 18.94||4000 / 15.15||4000 / 15.15|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||8 / 7.30||8 / 7.30||11 / 10||7 / 6.40|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||52 / 26||46 / 23||61 / 30.50||58 / 29||52 / 26|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||63 / 1600||63 / 1600||68 / 1524||68 / 1727||63 / 1600|
|Boiler Pressure (psi / kPa)||160 / 11||145 / 10||170 / 11.70||155 / 10.70||155 / 10.70|
|High Pressure Cylinders (dia x stroke) (in / mm)||17" x 24" / 432x610||17" x 24" / 432x610||19" x 24" / 432x610||19" x 24" / 483x610||17" x 24" / 432x610|
|Tractive Effort (lbs / kg)||14,973 / 6791.65||13,569 / 6154.80||18,411 / 8351.10||16,787 / 7614.46||14,505 / 6579.37|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.17||4.05||4.00||4.16||4.27|
|Firebox Area (sq ft / m2)||126 / 11.71||111.75 / 10.39||141.53 / 13.10||135.40 / 12.58||113.50 / 10.55|
|Grate Area (sq ft / m2)||16.43 / 1.53||17 / 1.58||20.50 / 1.91||17 / 1.58||20.90 / 1.94|
|Evaporative Heating Surface (sq ft / m2)||1390 / 129.09||1062 / 98.70||1775 / 164.78||1745 / 162.17||1415 / 131.51|
|Superheating Surface (sq ft / m2)|
|Combined Heating Surface (sq ft / m2)||1390 / 129.09||1062 / 98.70||1775 / 164.78||1745 / 162.17||1415 / 131.51|
|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||20,160||16,204||24,060||20,987||17,593|