Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 72, p 113. Works numbers were 57373-57378 in October 1923.
Wood-burning Ten-wheelers that served the RSM in both passenger and freight service. The superheated steam was admitted through 8" (203 mm) piston valves. The design repeated most of the specifications of the slightly earlier Consolidations, but had shorter boilers and longer, but narrower fireboxes that lay between the frames.
See Locobase 6708 for P W Fitzpatrick's letter describing the RSM's operating conditions at the time and the need for special sanding arrangements.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 172 |
| Locobase ID | 15268 |
| Railroad | Federaes Brazileiras Rede Sul Mineira (RSM) |
| Country | Brazil |
| Whyte | 4-6-0 |
| Number in Class | 6 |
| Road Numbers | 172-177 |
| Gauge | Metre |
| Number Built | 6 |
| Builder | Baldwin |
| Year | 1923 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11 / 3.35 |
| Engine Wheelbase (ft / m) | 20.33 / 6.20 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.54 |
| Overall Wheelbase (engine & tender) (ft / m) | 45.21 / 13.78 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 27,558 / 12,500 |
| Weight on Drivers (lbs / kg) | 76,000 / 34,473 |
| Engine Weight (lbs / kg) | 95,000 / 43,091 |
| Tender Loaded Weight (lbs / kg) | 65,000 / 29,484 |
| Total Engine and Tender Weight (lbs / kg) | 160,000 / 72,575 |
| Tender Water Capacity (gals / ML) | 3500 / 13.26 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 42 / 21 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 45 / 1143 |
| Boiler Pressure (psi / kPa) | 190 / 1310 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 20" / 406x508 |
| Tractive Effort (lbs / kg) | 18,375 / 8334.77 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.14 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 110 - 2" / 51 |
| Flues (number - dia) (in / mm) | 18 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 11.50 / 3.51 |
| Firebox Area (sq ft / m2) | 111 / 10.31 |
| Grate Area (sq ft / m2) | 16.30 / 1.51 |
| Evaporative Heating Surface (sq ft / m2) | 1088 / 101.08 |
| Superheating Surface (sq ft / m2) | 232 / 21.55 |
| Combined Heating Surface (sq ft / m2) | 1320 / 122.63 |
| Evaporative Heating Surface/Cylinder Volume | 233.77 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3097 |
| Same as above plus superheater percentage | 3654 |
| Same as above but substitute firebox area for grate area | 24,886 |
| Power L1 | 11,423 |
| Power MT | 994.08 |