The two small Moguls Baldwin built for the Canyon Line faced an operational environment that featured 3% grades and 24-degree curves.
Both were soon taken into the Chicago, Milwaukee, St Paul & Pacific in June 1910 and renumbered 6004-6005. In October 1912, the pair were renumbered once again as 2950-2951.
At some point, the pair received new boilers, each with a different tube count, and new fireboxes. The latter now measured 128 sq ft () in heating surface area although the grate area didn't change. The 102's 193 tubes offered 1,137 sq ft (105,63 sq m) in tube heating surface area while the 103 contained 211 tubes that yielded 1,234 sq ft (114.64 sq m).
After 20 yearss of service, 2950 was scrapped in October 1925. 2951 followed in December 1927.
The BB & BC was reorganized in October 1912 as the Bellingham & Northern, at which point this Mogul received road number 12. When the Milwaukee Road bought the B & N in December 1918, it designated this engine in its own class. By October 1928, it had been retired from service and scrapped.
The Milwaukee Road, which inherited these engines from the SIRR's successor Chicago, Terre Haute & Southeastern, retained them for several years on the same service before scrapping them in December 1930.
See Locobase 9874 for information about this rail line. Locobase 8131 shows some Louisville & Nashville F-8 moguls delivered by Rogers in 1906 that appear to have been very close in size to the CS engines, but were credited with much higher weights. The F-8s
deployed 1,583 sq ft of heating surface (including the firebox area), which suggests a figure of perhaps 1,600 sq ft for these engines.
As delivered, the CS locomotives included equipment from the following suppliers:
Midvale steel axles
Cook automatic bell ringers
Keasby & Mattison sectional magnesia boiler lagging
Simplex bolsters and brake-beams
American Brake-Shoe & Foundry Co.'s brake-shoes
Washburn pilot and Tower tender couplers
Elvlns driving box lubricators
U. S. headlights
Magnus metal journal bearings
Symington journal boxes
U. S. piston and valve rod packings
Ashton safety valves
Leach sanding devices
Nathan bull's-eye- sight-feed lubricators
Pittsburg Spring & Steel Co.'s springs
Crosby steam gages
Midvale driving and truck wheel tires.
The firebox heating surface area included 27 sq ft (2.5 sq m) of arch tubes. At the time of their service entry in 1906, these engines were among the biggest in their wheel arrangement anywhere.
|Specifications by Steve Llanso of Sweat House Media|
|Class||102 / M1||4 / M1-a||4 / M1-c||M1d||M2|
|Railroad||Montana RR (CMStP&P)||Bellingham Bay & British Columbia (CMStP&P)||Southern Indiana (CMStP&P)||Chicago Southern (CMStP&P)||Chicago, Milwaukee & Puget Sound (CMStP&P)|
|Number in Class||2||1||2||12||4|
|Road Numbers||102-103/6004-6005/2950-2951||4 / 2952||4-5 / 104-105 / 2956-2957||2958-2964||2975-2978|
|Builder||Burnham, Williams & Co||Burnham, Williams & Co||Burnham, Williams & Co||Alco-Rogers||Alco|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||15 / 4.57||14.50 / 4.42||11 / 3.35||15 / 4.57|
|Engine Wheelbase (ft / m)||22.67 / 6.91||21.83 / 6.65||18.25 / 5.56||23.08 / 7.03|
|Ratio of driving wheelbase to overall engine wheebase||0.66||0.66||0.60||0.65|
|Overall Wheelbase (engine & tender) (ft / m)||50 / 15.24|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||94,300 / 42,774||72,000 / 32,659||104,000 / 47,174||95,000 / 43,091||139,000 / 63,049|
|Engine Weight (lbs / kg)||113,000 / 51,256||85,000 / 38,555||115,000 / 52,163||120,000 / 54,431||159,000 / 72,121|
|Tender Loaded Weight (lbs / kg)||66,100 / 29,982||63,000 / 28,576||105,500 / 47,854|
|Total Engine and Tender Weight (lbs / kg)||179,100 / 81,238||178,000 / 80,739||264,500 / 119,975|
|Tender Water Capacity (gals / ML)||4000 / 15.15||2800 / 10.61||3000 / 11.36||4000 / 15.15||5000 / 18.94|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||9 / 8.20||8 / 7.30||10 / 9.10|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||52 / 26||40 / 20||58 / 29||53 / 26.50||77 / 38.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||63 / 1600||54 / 1372||52 / 1321||52 / 1321||63 / 1600|
|Boiler Pressure (psi / kPa)||190 / 13.10||130 / 9||160 / 11||160 / 11||200 / 13.80|
|High Pressure Cylinders (dia x stroke) (in / mm)||18" x 24" / 457x610||17" x 24" / 432x610||20" x 24" / 508x610||20" x 24" / 508x610||20" x 28" / 508x711|
|Tractive Effort (lbs / kg)||19,934 / 9041.92||14,193 / 6437.84||25,108 / 11388.81||25,108 / 11388.81||30,222 / 13708.48|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.73||5.07||4.14||3.78||4.60|
|Firebox Area (sq ft / m2)||113.40 / 10.54||105.30 / 9.79||140.70 / 13.08||213 / 19.79|
|Grate Area (sq ft / m2)||24.50 / 2.28||15.50 / 1.44||22.28 / 2.07||22 / 2.04||30.30 / 2.81|
|Evaporative Heating Surface (sq ft / m2)||1417 / 131.64||1148 / 106.69||1630 / 151.49||2535 / 235.51|
|Superheating Surface (sq ft / m2)|
|Combined Heating Surface (sq ft / m2)||1417 / 131.64||1148 / 106.69||1630 / 151.49||2535 / 235.51|
|Evaporative Heating Surface/Cylinder Volume||200.46||182.08||186.78||248.99|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||4655||2015||3565||3520||6060|
|Same as above plus superheater percentage||4655||2015||3565||3520||6060|
|Same as above but substitute firebox area for grate area||21,546||13,689||22,512||42,600|