Described in the diagram book as a "Forney", this is a classic commuter tank locomotive of the late 1890s. Baldwin's spec contains a 27 February 1893 addition showing the addition of a fuel rack to raise the locomotives' coal capacity to four tons.
They served the Chicago-Blue Island run of 17 miles (27.4 km/h) as well as limited trains to Joliet (40.4 miles/65 km/h). Pulling 3-8 cars and making between 18 and 20 stops, the engines would make the Blue Island run in 45 minutes.
Although the class arrived on the railroad with safety valve set at 180 psi (as Hohl reported), the setting had been reduced to 160 psi (11.03 bar) by 1903. To comply with Chicago smoke-abatement ordinances, the class was delivered with Barnes smoke burners. According to the city's Department of Health, they were six of the 2,704 locomotive that had been fitted with such devices. In listing the different railroads, the DoH named the Barnes, Dickson, Farr, Hutchison, Kunzer, Nutting, Walker, and Western devices.
Steam engines could be filthy beasts indeed, but they were far from alone in consuming the 4,247,174 tons of soft coal that they brought into Chicago in 1893. The DoH report provided a round-up of the various smoke preventers in use in stationary furnaces to underscore the city-wide commitment to suppressing smoke.
The consensus among many of the Master Mechanics attending a meeting in the same year was that the best smoke preventer was a good fireman. Smoke preventing devices could be useful when the engine was at rest or just starting, but they also increased coal consumption.
They ran for more than 30 years before being scrapped in 1926-1927.
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Railroad||Rock Island (CRI & P)|
|Number in Class||6|
|Builder||Burnham, Williams & Co|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||13.33 / 4.06|
|Engine Wheelbase (ft / m)||35.75 / 10.90|
|Ratio of driving wheelbase to overall engine wheebase||0.37|
|Overall Wheelbase (engine & tender) (ft / m)||35.75 / 10.90|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||107,000 / 48,534|
|Engine Weight (lbs / kg)||194,700 / 88,315|
|Tender Loaded Weight (lbs / kg)|
|Total Engine and Tender Weight (lbs / kg)||194,700|
|Tender Water Capacity (gals / ML)||2600 / 9.85|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||4 / 3.60|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||59 / 29.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||63.75 / 1619|
|Boiler Pressure (psi / kPa)||160 / 11|
|High Pressure Cylinders (dia x stroke) (in / mm)||18" x 24" / 457x610|
|Tractive Effort (lbs / kg)||16,589 / 7524.65|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||6.45|
|Firebox Area (sq ft / m2)||158 / 14.68|
|Grate Area (sq ft / m2)||23.26 / 2.16|
|Evaporative Heating Surface (sq ft / m2)||1551 / 144.09|
|Superheating Surface (sq ft / m2)|
|Combined Heating Surface (sq ft / m2)||1551 / 144.09|
|Evaporative Heating Surface/Cylinder Volume||219.42|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||3722|
|Same as above plus superheater percentage||3722|
|Same as above but substitute firebox area for grate area||25,280|