Chicago Great Western 2-10-2 "Santafe" Locomotives in 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.


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 [] 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.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID4179
RailroadChicago Great Western (CGW)
Number in Class7
Road Numbers800-806
Number Built7
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)21.33 / 6.50
Engine Wheelbase (ft / m)40.59 / 12.37
Ratio of driving wheelbase to overall engine wheebase 0.53
Overall Wheelbase (engine & tender) (ft / m)75.80 / 23.10
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)280,000 / 127,006
Engine Weight (lbs / kg)348,600 / 158,122
Tender Loaded Weight (lbs / kg)185,000 / 83,915
Total Engine and Tender Weight (lbs / kg)533,600 / 242,037
Tender Water Capacity (gals / ML)10,000 / 37.88
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)16 / 14.50
Minimum weight of rail (calculated) (lb/yd / kg/m)93 / 46.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)30" x 32" / 762x813
Tractive Effort (lbs / kg)73,440 / 33311.86
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.81
Heating Ability
Firebox Area (sq ft / m2)344 / 31.97
Grate Area (sq ft / m2)78 / 7.25
Evaporative Heating Surface (sq ft / m2)4656 / 432.71
Superheating Surface (sq ft / m2)1164 / 108.18
Combined Heating Surface (sq ft / m2)5820 / 540.89
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

  • 800 (Collection of Harold K. Vollrath)
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Wes Barris