Chicago Great Western 2-10-2 "Santa Fe" Locomotives of the USA

The Chicago Great Western Railway took delivery of its only "Santa Fe" type locomotives in 1916 with the arrival of seven built by the Baldwin Locomotive Works. These locomotives were designated as Class M-1 and were given road numbers 800 through 806. They had 60" diameter drivers, 30" x 32" cylinders, a 180 psi boiler pressure, exerted 73,440 pounds of tractive effort and each weighed 348,600 pounds.

The firebox heating surface includes 53 square feet of arch tubes and the piston valves measured 15" in diameter. Number 800's firebox received a makeover in January 1939 during which the number of arch tubes was cut to 18 square feet in total, but 106 square feet of thermic syphons was added to boost firebox heating surface to 415 square feet.

Six of the M-1s were scrapped during the 1930's but number 800 lasted until the end of steam.

There are no surviving CGW 2-10-2 "Santa Fe" type locomotives.


Roster by Richard Duley

ClassQty.Road NumbersYear BuiltBuilderNotes
M-1 7800-8061916BaldwinSix of these locomotives were scrapped the 1930.s. Number 800 lasted until the end of steam.

Class Details by Steve Llanso of Sweat House Media

Class M1s (Locobase 4179)

See http://www.geocities.com/zvwrr/chicago_great_western_steam.html for the original 1917 railroad diagrams. See also DeGolyer, Vol 55, pp. 36+. Works numbers were 44209-44314 in October 1916.

Firebox heating surface includes 53 sq ft (4.9 sq m) in five arch tubes. Piston valves measured 15" (381 mm) in diameter.

Much the biggest engine design delivered to the CGW before the 2-10-4s of the 1930s, these low-drivered engines operated at a relatively low 180 psi.

800's firebox received a makeover in January 1939 during which the number of arch tubes was cut to 18 sq ft (1.7 sq m) total, but 106 sq ft (9.85 sq m) of thermic syphons was added to boost firebox heating surface to 415 sq ft (38.55 sq m).

(Drury's (1993) tractive effort figure of 43,440 lb looks like a miskey, but he is incorrect in his statement that the railroad's Mikados generated considerably more. Once the Texas engines came on the road in the 1930s, six of these drag-freight locomotives were scrapped. The class leader lasted until the end of steam.

Specifications by Steve Llanso of Sweat House Media
ClassM1s
Locobase ID4179
RailroadChicago Great Western (CGW)
CountryUSA
Whyte2-10-2
Number in Class7
Road Numbers800-806
GaugeStd
Number Built7
BuilderBaldwin
Year1916
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)21.33
Engine Wheelbase (ft)40.59
Ratio of driving wheelbase to overall engine wheebase 0.53
Overall Wheelbase (engine & tender) (ft)75.80
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)280,000
Engine Weight (lbs)348,600
Tender Loaded Weight (lbs)185,000
Total Engine and Tender Weight (lbs)533,600
Tender Water Capacity (gals)10,000
Tender Fuel Capacity (oil/coal) (gals/tons)16
Minimum weight of rail (calculated) (lb/yd)93
Geometry Relating to Tractive Effort
Driver Diameter (in)60
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)30" x 32"
Tractive Effort (lbs)73,440
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.81
Heating Ability
Firebox Area (sq ft)344
Grate Area (sq ft)78
Evaporative Heating Surface (sq ft)4656
Superheating Surface (sq ft)1164
Combined Heating Surface (sq ft)5820
Evaporative Heating Surface/Cylinder Volume177.85
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14,040
Same as above plus superheater percentage16,848
Same as above but substitute firebox area for grate area74,304
Power L111,587
Power MT456.16

Photos

Reference


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