Flint & Pere Marquette 4-2-4 Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class J J McCormick (Locobase 5710)

Data from "Locomotive for Local Traffic on the Flint & Pere Marquette Railroad," The American Engineer & Railroad Journal, Vol LXVIII [68], No 6 (June 1894) , pp. 205-206. See also John H White, Jr, "American Single Locomotives and the 'Pioneer'", Smithsonian Studies in History and Technology #25 (Washington, DC: Smithsonian Institution Press, 1973), pp. 15-16. (Thanks to Chris Hohl for his email supplying the correct tender capacities.)

Of the 14,500+ entries in Locobase at time of the latest update of this entry, only three entries used this wheel arrangement. (The other two were Southern Pacific's C P Huntington--Locobase 4133--and some inspection locomotives on the New York Central described in Locobase 15622.)

John White reports that Mister TJ Hatswell, Master Mechanic of the F&PM, built this pair of single-wheelers from older 4-4-0s for local passenger traffic on a branch line between Bay City and Saginaw. (The second engine was named G C Kimball.). It's not clear from any of the sources just when these two were rebuilt, but the 1894 report suggested it had happened not long before.

White reproduced the AERJ figure on page 16 that reveals Hatswell's integration of a Belpaire-boilered American on a long frame that supported a Belpaire firebox, a large cab and bunker. Each end had a full-sized pilot, but only the smokebox end had a headlight.

The AERJ's profile reported that"... the engines are doing remarkably good work ...hauling trains ranging from two to six cars on a fast schedule time ...giving perfect satisfaction." (Very few locomotives described in the AERJ ever gave less than perfect satisfaction ...)

Principal Dimensions by Steve Llanso of Sweat House Media
ClassJ J McCormick
Locobase ID5710
RailroadFlint & Pere Marquette
Number in Class2
Road Numbers9, 11
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)29 / 8.84
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft / m)29 / 8.84
Axle Loading (Maximum Weight per Axle) (lbs / kg)40,000 / 18,144
Weight on Drivers (lbs / kg)40,000 / 18,144
Engine Weight (lbs / kg)80,000 / 36,287
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)80,000
Tender Water Capacity (gals / ML)1200 / 1.14
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)2
Minimum weight of rail (calculated) (lb/yd / kg/m)67 / 33.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)67.50 / 1715
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)15" x 22" / 381x559
Tractive Effort (lbs / kg)8103 / 3675.46
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.94
Heating Ability
Firebox Area (sq ft / m2)84.49 / 7.85
Grate Area (sq ft / m2)12.51 / 1.16
Evaporative Heating Surface (sq ft / m2)787 / 73.14
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)787 / 73.14
Evaporative Heating Surface/Cylinder Volume174.90
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1626
Same as above plus superheater percentage1626
Same as above but substitute firebox area for grate area10,984
Power L13931
Power MT216.66

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