Natchez & Hamburg 0-4-0 "Switcher" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Mississippi (Locobase 1018)

First locomotive in the Deep South. Source (Kinert, 1962) gives tractive power as 4,820 lb, but given the year in which the Mississippi was built, this seems very high. Driver diameter is given as 43 in, but that would require a boiler pressure of 170 lb, which, again, seems unlikely for this era.

Anthony Bianculli (Trains & Technology, Vol 1, 2001) gives the same data and credits it to Henry Dunham of New York.

I still find that 170 psi very hard to believe.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID1018
RailroadNatchez & Hamburg
Number in Class1
Road Numbers
Number Built1
BuilderHenry Dunham
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m) 4.67 / 1.42
Engine Wheelbase (ft / m) 4.67 / 1.42
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)15.42 / 4.70
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)19,700 / 8936
Engine Weight (lbs / kg)19,700 / 8936
Tender Loaded Weight (lbs / kg)7000 / 3175
Total Engine and Tender Weight (lbs / kg)26,700 / 12,111
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)16 / 8
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43 / 1092
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)9.5" x 16" / 241x406
Tractive Effort (lbs / kg)4853 / 2201.29
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.06
Heating Ability
Tubes (number - dia) (in / mm)51 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 7.58 / 2.31
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2) 6.40 / 0.59
Evaporative Heating Surface (sq ft / m2)
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1088
Same as above plus superheater percentage1088
Same as above but substitute firebox area for grate area
Power L1
Power MT

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Wes Barris