Central Michigan 4-2-0 "Jervis" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Ann Arbor (Locobase 5574)

Data from a May 1, 1858 table prepared by CG Hammond, General Superintendent of the CB&Q shown in Corbin & Kerka (1960), pp 254-255. Works number was 93.

The boiler pressure is estimated. The grate area, firebox heating surface, and total heating surface are calculated. See Locobase 5552 for full explanation. While the dimensions are not derived from actual measurement, they agree with those of similar American locomotives of the era.

Wood-burning, outside-connected engine from the very early days. The "single's" boiler was 14' 7" long.

The Michigan Central renamed this engine Pigeon, and sold it to the Chicago & Aurora in the mid-1850s. In 1855, the C & A was part of the Chicago, Burlington & Quincy; it was at that point that engine was renamed Pigeon. By 1858 Pigeon was described as "laid up" and needing rebuilding. Apparently that occurred, for the locomotive was renamed Rambler in 1862.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassAnn Arbor
Locobase ID5574
RailroadCentral Michigan
Number in Class1
Road Numbers
Number Built1
BuilderMatthias Baldwin
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)28,000 / 12,701
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)100 / 6.90
High Pressure Cylinders (dia x stroke) (in / mm)13" x 16" / 330x406
Tractive Effort (lbs / kg)3831 / 1737.71
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Firebox Area (sq ft / m2)43.33 / 4.03
Grate Area (sq ft / m2)10.83 / 1.01
Evaporative Heating Surface (sq ft / m2)843 / 78.35
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)843 / 78.35
Evaporative Heating Surface/Cylinder Volume342.96
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1083
Same as above plus superheater percentage1083
Same as above but substitute firebox area for grate area4333
Power L14311
Power MT

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