Rock Island 2-6-6 Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class K-17/27-A/F-16 (Locobase 6546)

Data from CRI&P Locomotive Diagram book from 1903 supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also E E R Tratman, "Tank Locomotives", Official Proceedings of the Western Railway Club (Chicago: W F Hall Printing Company, 1905), pp. 351; and DeGolyer, Volume 18, p. 146. Works numbers were 13237-13238, 13245, 13261, 13267, and 13297.

Described in the diagram book as a "Forney", this is a classic commuter tank locomotive of the late 1890s. 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.

They ran for more than 30 years before being scrapped in 1926-1927.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID6546
RailroadRock Island (CRI & P)
Number in Class6
Road Numbers1001-06/601-06/1051-56
Number Built6
BuilderBurnham, Williams & Co
Valve GearStephenson
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)
Minimum weight of rail (calculated) (lb/yd / kg/m)59 / 29.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63.75 / 1621
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
Heating Ability
Firebox Area (sq ft / m2)158 / 14.68
Grate Area (sq ft / m2)23.26 / 2.16
Evaporative Heating Surface (sq ft / m2)1551 / 144.14
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1551 / 144.14
Evaporative Heating Surface/Cylinder Volume219.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3722
Same as above plus superheater percentage3722
Same as above but substitute firebox area for grate area25,280
Power L15630
Power MT348.00