Data from CGW 7 1902 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 1640 in July 1885 and 1742 in January 1887.
In the midst of a big order for Eight-wheelers of several sizes, the M&N ordered these two suburban tanks.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | G/Motor |
| Locobase ID | 16225 |
| Railroad | Minnesota & Northwestern (CGW) |
| Country | USA |
| Whyte | 2-4-4T |
| Number in Class | 2 |
| Road Numbers | 12, 37/1-2 |
| Gauge | Std |
| Number Built | |
| Builder | Cooke |
| Year | 1887 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6 / 1.83 |
| Engine Wheelbase (ft / m) | 24.42 / 7.44 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.25 |
| Overall Wheelbase (engine & tender) (ft / m) | 24.42 / 7.44 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 45,000 / 20,412 |
| Engine Weight (lbs / kg) | 75,000 / 34,019 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1200 / 4.55 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 38 / 19 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 48 / 1219 |
| Boiler Pressure (psi / kPa) | 145 / 1000 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12" x 20" / 305x508 |
| Tractive Effort (lbs / kg) | 7395 / 3354.32 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.09 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 108 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 9.25 / 2.82 |
| Firebox Area (sq ft / m2) | 58 / 5.39 |
| Grate Area (sq ft / m2) | 11.30 / 1.05 |
| Evaporative Heating Surface (sq ft / m2) | 581 / 53.98 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 581 / 53.98 |
| Evaporative Heating Surface/Cylinder Volume | 221.76 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1639 |
| Same as above plus superheater percentage | 1639 |
| Same as above but substitute firebox area for grate area | 8410 |
| Power L1 | 3856 |
| Power MT | 377.82 |