Bellingham Bay & British Columbia / Chicago Southern / Chicago, Milwaukee & Puget Sound / Montana RR / Southern Indiana 2-6-0 "Mogul" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 102 / M1 (Locobase 9887)

Data from Milwaukee Road 1930 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 27, p. 237. Works numbers were anagrams of each other: 25643 in May 1905, 26534 in October.

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.

Class 4 / M1-a (Locobase 11999)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 17, p. 120. Works number was 12231 in September 1891.

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.

Class 4 / M1-c (Locobase 12556)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 24, p.74 . Works numbers were 19504-19505 in August 1901.

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.

Class M1d (Locobase 11465)

Data from "Locomotive Building," The Railroad Gazette, Vol XXXVIII, No 17 (28 April 1905), p 149.

See Locobase 11466 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:

Westinghouse air-brakes

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

Nathan injectors

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.

Class M2 (Locobase 15115)

Data from MILWRD 1930ca Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

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
Class102 / M14 / M1-a4 / M1-cM1dM2
Locobase ID9887 11,999 12,556 11,465 15,115
RailroadMontana 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 Class212124
Road Numbers102-103/6004-6005/2950-29514 / 29524-5 / 104-105 / 2956-29572958-29642975-2978
Number Built212124
BuilderBurnham, Williams & CoBurnham, Williams & CoBurnham, Williams & CoAlco-RogersAlco
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)1514.501115
Engine Wheelbase (ft)22.6721.8318.2523.08
Ratio of driving wheelbase to overall engine wheebase 0.66 0.66 0.60 0.65
Overall Wheelbase (engine & tender) (ft)50
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)94,30072,000104,00095,000139,000
Engine Weight (lbs)113,00085,000115,000120,000159,000
Tender Loaded Weight (lbs)66,10063,000105,500
Total Engine and Tender Weight (lbs)179,100178,000264,500
Tender Water Capacity (gals)40002800300040005000
Tender Fuel Capacity (oil/coal) (gals/tons)9810
Minimum weight of rail (calculated) (lb/yd)5240585377
Geometry Relating to Tractive Effort
Driver Diameter (in)6354525263
Boiler Pressure (psi)190130160160200
High Pressure Cylinders (dia x stroke) (in)18" x 24"17" x 24"20" x 24"20" x 24"20" x 28"
Tractive Effort (lbs)19,93414,19325,10825,10830,222
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.73 5.07 4.14 3.78 4.60
Heating Ability
Firebox Area (sq ft)113.40105.30140.70213
Grate Area (sq ft)24.5015.5022.282230.30
Evaporative Heating Surface (sq ft)1417114816302535
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1417114816302535
Evaporative Heating Surface/Cylinder Volume200.46182.08186.78248.99
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation46552015356535206060
Same as above plus superheater percentage46552015356535206060
Same as above but substitute firebox area for grate area21,54613,68922,51242,600
Power L15600310737087426
Power MT392.76285.41235.81353.34