Santa Fe 4-8-2 "Mountain" Type Locomotives

Class 3700 (Locobase 194)

Data from AT&SF 9 -1920 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Information about how many, when, and by whom this class was supplied from http://atsf.railfan.net/atsfstea.html (accessed 6 Feb 2006), the Santa Fe All-Time Steam Roster maintained by Evan Werkema. Works numbers were:

1918

May 48576, 48736

1919

February 51261 in February 1919

March 51482, 51591-51592, 51627-51628

April 51694, 51739-51741

1920

July 53467

August 53508-53509, 53560, 53578-53579, 53613

September 53686-53687, 53760

1921

August 54983-54994

September 55044-55046

1923

August 56866-56868

September 57004-57008

1924

March 57699-57703

April 57755.

Firebox heating surface included 38 sq ft of arch tubes.

Note the square cylinder measurements; the stroke is usually longer than the cylinder bore is wide. Later members in the class built in 1924 ran at 220 lb psi and showed a slightly higher tractive effort.

Retired in 1950-1955.

Specifications
Class3700
Locobase ID194
RailroadSanta Fe (ATSF)
Whyte4-8-2
Road Numbers3700-3750
GaugeStd
BuilderBaldwin
Year1921
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase18'
Engine Wheelbase39.50'
Ratio of driving wheelbase to overall engine wheebase 0.46
Overall Wheelbase (engine & tender)76.78'
Axle Loading (Maximum Weight per Axle)60800 lbs
Weight on Drivers240640 lbs
Engine Weight355760 lbs
Tender Light Weight233720 lbs
Total Engine and Tender Weight589480 lbs
Tender Water Capacity12000 gals
Tender Fuel Capacity (oil/coal)16 tons
Minimum weight per yard of rail on which locomotive could run100 lb rail
Geometry Relating to Tractive Effort
Driver Diameter69"
Boiler Pressure200 psi
Cylinders (dia x stroke)28" x 28"
Tractive Effort54085 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.45
Heating Ability
Firebox Area373 sq. ft
Grate Area71.70 sq. ft
Evaporative Heating Surface4792
Superheating Surface1087
Combined Heating Surface5879
Evaporative Heating Surface/Cylinder Volume240.14
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14340
Same as above plus superheater percentage16921
Same as above but substitute firebox area for grate area88028
Power L118949
Power MT694.40

Reference

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.

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