Chicago & Illinois Midland 4-4-0 "American" Type Locomotives

Class Details by Steve Llanso

Class A-1 (Locobase 7651)

Data from C&IM 4 -1954 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers were 60064-60065 in June 1927 and 60590 in August 1928.

According to George Drury (1993), these were the last three Americans built for any railroad in North America. Yet, as Drury notes, this purchase wasn't a fluke. The railroad still ran a Springfield-Peoria passenger service daily and even upgraded its passenger car fleet by buying 6 steel passenger cars. The three locomotives provided enough power for the trains on the schedule and could even be double-headed in a pinch.

By the late 1940s, passenger traffic had withered and 501 was sold for scrap. The last passenger train ran in 1953 and the surviving pair of 4-4-0s went to the scrapyard as well.

Specifications by Steve Llanso
Locobase ID7651
RailroadChicago & Illinois Midland
Road Numbers500-502
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase7'
Engine Wheelbase21.33'
Ratio of driving wheelbase to overall engine wheebase 0.33
Overall Wheelbase (engine & tender)47.92'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers77400 lbs
Engine Weight118400 lbs
Tender Light Weight109960 lbs
Total Engine and Tender Weight228360 lbs
Tender Water Capacity4500 gals
Tender Fuel Capacity (oil/coal)10 tons
Minimum weight of rail (calculated) on which locomotive could run65 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter64"
Boiler Pressure180 psi
Cylinders (dia x stroke)18" x 24"
Tractive Effort18590 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.16
Heating Ability
Firebox Area113 sq. ft
Grate Area22.20 sq. ft
Evaporative Heating Surface1170 sq. ft
Superheating Surface227 sq. ft
Combined Heating Surface1397 sq. ft
Evaporative Heating Surface/Cylinder Volume165.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3996
Same as above plus superheater percentage4635
Same as above but substitute firebox area for grate area23594
Power L110262
Power MT584.59



Introduction and roster provided by Richard Duley. Class details and specifications provided by Steve Llanso of Sweat House Media.