International & Great Northern 0-6-0 "Switcher" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class SW-55 (Locobase 11188)

Data from MP 8 -1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

Although Locobase has not yet included many North American switchers, he couldn't resist the unusual lineaments of this home-built. In addition to the saddle tank, this design sported widely spaced axles the spacing which was 7 ft 8 in (2.34 m) between the first and second and a full 9 feet (2.74 m) between the second and third. Add to that inside valve gear, rounded dome over the firebox and thus separating the saddle tank from the cab and IGN had a distinctive little locomotive..

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID11188
RailroadInternational & Great Northern (MP)
Number in Class1
Road Numbers9575
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)16.67 / 5.08
Engine Wheelbase (ft / m)16.67 / 5.08
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)16.67 / 5.08
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)130,000 / 58,967
Engine Weight (lbs / kg)130,000 / 58,967
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)130,000
Tender Water Capacity (gals / ML)2000 / 7.58
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)3 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)72 / 36
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55 / 1397
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)14,243 / 6460.52
Factor of Adhesion (Weight on Drivers/Tractive Effort) 9.13
Heating Ability
Tubes (number - dia) (in / mm)188 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.83 / 3.61
Firebox Area (sq ft / m2)104 / 9.67
Grate Area (sq ft / m2)17 / 1.58
Evaporative Heating Surface (sq ft / m2)1268 / 117.84
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1268 / 117.84
Evaporative Heating Surface/Cylinder Volume226.83
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2550
Same as above plus superheater percentage2550
Same as above but substitute firebox area for grate area15,600
Power L14398
Power MT223.75

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Wes Barris