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
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
Class 4101 (Locobase 469)
Data from table in 1930 Locomotive Cyclopedia and diagram presented at http://www.railroadingonline.net/
/c4193-1.gif and the Kansas Memory digital collection of Santa Fe diagrams at http://www.kansasmemory.org/item/221763/page/280
. 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.