Santa Fe 2-8-4 "Berkshire" Locomotives

The Atchison, Topeka & Santa Fe Railroad bought fifteen "Berkshires" type locomotives from the Baldwin Locomotive Works in 1927. These locomotives were designated as Class 4101 and assigned road numbers 4101 through 4115. The AT&SF was the only western railroad to have purchased new 2-8-4s.

These Class 4101 "Berkshires" had 63" diameter drivers, 27" x 32" cylinders, a boiler pressure of 220 psi with a resultant tractive effort of 69,200 pounds (number 4115 had a 250 psi boiler pressure, which raised its tractive effort to 78,685 lbs). Each of the fifteen locomotives weighed 393,000 pounds.

The AT&SF also bought seven used "Berkshire" type locomotives from the Boston & Maine during the closing months of World War II.

There are no surviving AT&SF 2-8-4 "Berkshire" type locomotives

Roster by Richard Duley

Class Qty. Road Numbers Year Built Builder Notes
4101 15 4101-4115 1927 Baldwin 1
4193 7 4193-4199 1928 Lima 2
  1. Numbers 4101-4115 scrapped in 1954-1955.
  2. Numbers 4193-4199 bought from the Boston & Maine in 1945. Ex B&M numbers 40 01, 4003, 4004, 4008, 4011, 4015 & 4018. Numbers 4193-4199 scrapped between 194 9 and 1955.

Class Details by Steve Llanso of Sweat House Media

Class 4101 (Locobase 469)

Data from table in 1930 Locomotive Cyclopedia and diagram presented at /c4193-1.gif and the Kansas Memory digital collection of Santa Fe diagrams at . See also DeGolyer, Vol 77, pp. 2+ and 41+. Works numbers were 59952-59955, 59977-59978, 59988-59992 in April 1927 and 60029-60032 in May.

Described by Drury (1993) as "basically good 1922 engines with a 1927 wheel arrangement." An assessment borne out by the tube-to-flue ratio and relatively meager supplementary heating surface areas. Boiler had Elesco H-5 feedwater heater and 44 sq ft (4.1 sq m) of arch tubes contributing to the direct heating surface. Steam was admitted through 15" (381 mm) piston valves.

4115 was delivered with a boiler designed to be pressed to 250 psi (17.25 bar) with a cutoff set to 68%. This combination of stroke length and boiler pressure yielded the same tractive effort as the others, but the piston load was calculated to increase by 15%. Other slight differences included a valve travel of 9 1/2" (241 mm), 1/2" (12.7 mm) longer than the valves in the others.

15 engines delivered in 1927, retired in 1954.

Specifications by Steve Llanso of Sweat House Media
Class 4101
Locobase ID 469
Railroad Santa Fe (ATSF)
Country USA
Whyte 2-8-4
Road Numbers 4101-4115
Gauge Std
Builder Baldwin
Year 1927
Valve Gear Walschaert
Locomotive Length and Weight
Driver Wheelbase 16.50'
Engine Wheelbase 37.20'
Ratio of driving wheelbase to overall engine wheebase 0.44
Overall Wheelbase (engine & tender) 81.60'
Axle Loading (Maximum Weight per Axle) 70480 lbs
Weight on Drivers 268200 lbs
Engine Weight 396500 lbs
Tender Light Weight 285100 lbs
Total Engine and Tender Weight 681600 lbs
Tender Water Capacity 15000 gals
Tender Fuel Capacity (oil/coal) 20 tons
Minimum weight of rail (calculated) 112 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter 63"
Boiler Pressure 220 psi
Cylinders (dia x stroke) 27" x 32"
Tractive Effort 69243 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.87
Heating Ability
Firebox Area 338 sq. ft
Grate Area 99 sq. ft
Evaporative Heating Surface 4577 sq. ft
Superheating Surface 1246 sq. ft
Combined Heating Surface 5823 sq. ft
Evaporative Heating Surface/Cylinder Volume 215.84
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation 21780
Same as above plus superheater percentage 26354
Same as above but substitute firebox area for grate area 89976
Power L1 19043
Power MT 626.14



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