The CM was formed in 1883 by Homer D Fisher to connect Colorado Springs through the Ute Pass into South Park and, from there, continue on to Salida and Leadville by the "most eligible route." The charter also included the intent to put a telegraph line as well. According to Stamm, both the Union Pacific and the Denver & Rio Grande chose to try to block the line by doubling the price of materials, a tactic that backfired when then-CM President James J Hagerman exploited resentment of such heavy-handed moves to raise eastern money.
The road opened to Buena Vista on 13 July 1887 and, according to Stamm, the CM had already bought more than 2 dozen engines from Schenectady. The 15 he describes as a passenger engine, although its 57" drivers suggest only modest speed.
RG's report indicates the challenges to be overcome by this design. Rail weight at best was a typical, but still modest 65 lb/yard (32.5 kg/metre) and maximum grade inclination measured 4%. Calculating an estimate of maximum trailing load up 4% yielded 150 tons, which RG notes was "...about equal to that of a train composed of two heavy sleeping cars, two first-class passenger coaches, and two baggage or express cars." The writer concluded the design is up to the challenge: "This engine is, however, one of the heaviest and most powerful passenger engines ever built, and at the same time appears to possess a sufficiently flexible wheel base to run over curves even sharper than those on the Colorado Midland."
The author doesn't neglect downhill running, "...which is often a matter of more difficulty and danger than the ascent, especially when the grades are long and the sudden rain and snow storms prevalent amongst the mountains are apt to convert a dry rail into a very slippery surface without warning. The engines are equipped with Westinghouse brake for tender and train, American steam brake on all drivers and Le Chatelier water brake for cylinders."
Some remained with the CM, but 15 was later sold to locomotive rebuilder/reseller Birmingham Rail & Locomotive, who placed on Milton S Hershey's benevolently run FC Cubano de Hershey in Hershey, Cuba.
BR&L found a buyer for ex-19 in the Motley County Railway of Matador, Texas. It later moved on to the Quanah, Acme & Pacific.
Ex-20 went to Zimmerman-Wells-Brown, a lumber company based in Portland Ore and ex-21 found similar work as Kirby Lumber's #79 in Kirby, Texas.
These Ten-wheelers served the CM until it was abandoned in July 1919. 31 then was sold to Robinson Land & Lumber Company and 34 went to Horse Shoe Lumber of River Falls, Ala. 37 traveled further, winding up on the Hershey de Cubano, the Hershey Corporations railroad near Havana.
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Railroad||Colorado Midland||Colorado Midland|
|Number in Class||8||10|
|Builder||Schenectady||Burnham, Parry, Williams & Co|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||12 / 3.66||11.75 / 3.58|
|Engine Wheelbase (ft / m)||22.25 / 6.78||21.92 / 6.68|
|Ratio of driving wheelbase to overall engine wheebase||0.54||0.54|
|Overall Wheelbase (engine & tender) (ft / m)||48.67 / 14.83||49.17 / 14.99|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||99,000 / 44,906||88,000 / 39,916|
|Engine Weight (lbs / kg)||121,000 / 54,885||110,000 / 49,895|
|Tender Loaded Weight (lbs / kg)||77,083 / 34,964|
|Total Engine and Tender Weight (lbs / kg)||198,083 / 89,849|
|Tender Water Capacity (gals / ML)||3800 / 14.39||3850 / 14.58|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||55 / 27.50||49 / 24.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||57 / 1448||49 / 1219|
|Boiler Pressure (psi / kPa)||160 / 11||160 / 11|
|High Pressure Cylinders (dia x stroke) (in / mm)||19" x 26" / 483x660||19" x 24" / 483x610|
|Tractive Effort (lbs / kg)||22,395 / 10158.21||24,047 / 10907.55|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.42||3.66|
|Firebox Area (sq ft / m2)||133.30 / 12.38||155.50 / 14.45|
|Grate Area (sq ft / m2)||28.60 / 2.66||26.60 / 2.47|
|Evaporative Heating Surface (sq ft / m2)||1914 / 177.81||1981 / 184.11|
|Superheating Surface (sq ft / m2)|
|Combined Heating Surface (sq ft / m2)||1914 / 177.81||1981 / 184.11|
|Evaporative Heating Surface/Cylinder Volume||224.33||251.53|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||4576||4256|
|Same as above plus superheater percentage||4576||4256|
|Same as above but substitute firebox area for grate area||21,328||24,880|