Coln- Minden 2-2-2 Locomotives in Germany

Class Details by Steve Llanso of Sweat House Media

Class Oker (Locobase 628)

Data from Gustav Reder, The World of Steam Locomotives (1974). Works numbers were 394-397 in 1869.

Based on Borsig's 2-2-2 "Spinning Wheels" (see BEUTH entry), Richard Hartmann's 4 Cologne-and-Minden engines showed the effects of 15 years of general locomotive progress. The firebox had a high crown and the steam dome was located well forward, just behind the tall, capped stack. The cylinders were horizontal and mounted just ahead of the front carrying axle. These engines are typical of of the 228 2-2-2s ordered by German railroads from 1851 and 1875. When fitted with 78-in drivers, they became known as the "Racers."

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID628
RailroadColn- Minden
Number in Class4
Road Numbers
Number Built4
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)15.44 / 4.71
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)28,224 / 12,802
Engine Weight (lbs / kg)70,340 / 31,906
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)47 / 23.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)66 / 1676
Boiler Pressure (psi / kPa)120.40 / 8.30
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x508
Tractive Effort (lbs / kg)6978 / 3165.17
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2) 9.70 / 0.90
Evaporative Heating Surface (sq ft / m2)910 / 84.57
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)910 / 84.57
Evaporative Heating Surface/Cylinder Volume222.46
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1168
Same as above plus superheater percentage1168
Same as above but substitute firebox area for grate area
Power L1
Power MT

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