Twelve by Baldwin, a thirteenth (S-4A) by the West Burlington shops using a Baldwin boiler. All but 4001 had Elesco feedwater heaters; 4001 had a Worthington. Other goodies included a Barco Type 4 power reverse gear, Type B stokers, and 14" diameter pistons. Firebox heating surface included 43 sq ft (4.0 sq m) of arch tubes and 70 sq ft (6.5 sq m) of combustion chamber.
Corbin & Kerka report that when these locomotives went into service pulling such trains as the Ak-Sar-Ben, the Aristocrat, and the Black Hawk, the Burlington was able to do away with swapping one locomotive for another during the trip. One is credited with hauling 10 standard passenger cars between Cochrane and La Crosse (Wis) at 112 mph. The authors conclude "The 4-6-4 types were perhaps the some of the most successful locomotives used on the Chicago, Burlington & Quincy."
One (3002) was streamlined to resemble the stainless-steel Zephyrs, renumbered 4000 and called Aeolus and nicknamed "Big Alice the Goon." After her success, a second was built from scratch and numbered 4002.
The modification, dubbed S-4A, was more than cosmetic. They also received Box-Pok drivers and roller bearings in the lightweight side rods. Three more S-4s (3008, 3009, and 3011) received the running gear upgrades in 1938, but not the shrouds. They were renumbered 4003-4005.
Corbin & Kerka (1960); Railway Age 7 March 1931; and locomotive diagram published on Vernon Beck's website -- http://home.earthlink.net/~vnlbeck/S/s4j.tif (accessed 22 March 2003)
|Specifications by Steve Llanso|
|Railroad||Chicago, Burlington & Quincy (CB&Q)|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.34|
|Overall Wheelbase (engine & tender)||82.23'|
|Axle Loading (Maximum Weight per Axle)||69780 lbs|
|Weight on Drivers||207730 lbs|
|Engine Weight||391880 lbs|
|Tender Light Weight||326050 lbs|
|Total Engine and Tender Weight||717930 lbs|
|Tender Water Capacity||15000 gals|
|Tender Fuel Capacity (oil/coal)||24 tons|
|Minimum weight of rail (calculated) on which locomotive could run||115 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||250 psi|
|Cylinders (dia x stroke)||25" x 28"|
|Tractive Effort||47676 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.36|
|Firebox Area||369 sq. ft|
|Grate Area||87.90 sq. ft|
|Evaporative Heating Surface||4247 sq. ft|
|Superheating Surface||1830 sq. ft|
|Combined Heating Surface||6077 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||266.97|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||21975|
|Same as above plus superheater percentage||28568|
|Same as above but substitute firebox area for grate area||119925|