Chicago & South Side Rapid Transit 0-4-4 "Forney" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 6459)

Data from Locomotive Engineers' Monthly Journal, Vol XXVI, #12 (December 1892), pp. 1100-1102. http://www.discoverlivesteam.com/magazine/42.html (visited 31 Jan 2005). See also DeGolyer, Volume 17, p. 226 and Volume 18, p. 96. Works numbers were 12555-12556, 12558-12559, 12562-12569, 12571-12575 in March 1892; 12579, 12599, 12606 in April; 12982-12984, 12989-12991, 13001-13005, 13010 in October; and 13013-13015, 13026-13027, 13031, 13042-13043, 13047-13048, 13062, 13065, 13067 in November.

Bruce G Moffet's account of "Steam on the Alley 'L'" describes these unusual elevated locomotives. Like all such designs, the class had to be able to accelerate rapidly while pulling a 5-car train and averaging 15 mph (an average 3 mph higher than the more famous New York Elevateds). Although Baldwin used the basic layout pioneered by Matthias Forney, this class gained its power from a 4-cylinder Vauclain compound layout. (Locobase supposes that the rationale was a smoother cycle and, with an interception valve letting in live steam to all four cylinders, getaway power of much greater authority.)

Presumably to reduce smoke in the urban center, these engines had a fuel space suitable for anthracite egg coal" and enough for 20 miles run.

Upon delivery in June 1892, Moffet notes, the locomotives saw heavy use: "Service was provided on an around-the-clock basis with intervals ranging from as close as every 2+ minutes during rush hours to every 20 minutes during the ôowlö period (Midnight to 5:00am)."

Electrification of the system followed relatively soon afterward, with the last of the steamers being retired on 27 July 1898. Ten were sold to New York in 1899 to pull elevated trains over the Brooklyn Bridge.

(Ten had been sold by Baldwin to the Long Island Railroad in 1892 as 150-159.)

Many continued in use in a variety of industrial settings as well as on small railroads. And at least one country club (Midlothian Country Club). The railroads included the Chicago Union Transfer, Coronado Railway, Roaring Creek & Charleston, Sheffield & Tionesta, Topeka & Vinewood Park, Trinity Valley Railroad, Vernon Tram Co, and the Wisconsin Ruby & Southern.

Specifications by Steve Llanso of Sweat House Media
Class1
Locobase ID6459
RailroadChicago & South Side Rapid Transit
CountryUSA
Whyte0-4-4T
Number in Class45
Road Numbers1-45
GaugeStd
Number Built45
BuilderBurnham, Williams & Co
Year1892
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase5'
Engine Wheelbase16.33'
Ratio of driving wheelbase to overall engine wheebase 0.31
Overall Wheelbase (engine & tender)16.33'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers40000 lbs
Engine Weight58000 lbs
Tender Light Weight
Total Engine and Tender Weight58000 lbs
Tender Water Capacity750 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)33 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter42"
Boiler Pressure150 psi
High Pressure Cylinders (dia x stroke)9" x 16"
Low Pressure Cylinders (dia x stroke)15" x 16" (2)
Tractive Effort5786 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.91
Heating Ability
Firebox Area70 sq. ft
Grate Area19 sq. ft
Evaporative Heating Surface555 sq. ft
Superheating Surface
Combined Heating Surface555 sq. ft
Evaporative Heating Surface/Cylinder Volume471.10
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2850
Same as above plus superheater percentage2850
Same as above but substitute firebox area for grate area10500
Power L12904
Power MT320.11


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