Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 66, p.207. Works numbers were 53766-53769 in September 1920 and 53804, 53848-53850, 53880-53881 in October
Following the Moguls (Locobase 15107) and Consolidations (Locobase 15108) sold by Baldwin to the Noroeste in 1919, this set of Pacifics was also superheated and had the same-size drivers as the 2-6-0s. They were driven by smaller cylinders, however, that were supplied through 8" (203 mm) piston valves. The wider, shallower firebox was designed to burn either coal or wood.
The class's specification included sharper curves than appeared on the orders for the earlier locomotives. Curve radii could be as tight as 246 feet (75 metres).
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 401 |
| Locobase ID | 15109 |
| Railroad | Noroeste |
| Country | Brazil |
| Whyte | 4-6-2 |
| Number in Class | 10 |
| Road Numbers | 401-410 |
| Gauge | Metre |
| Number Built | 10 |
| Builder | Baldwin |
| Year | 1920 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8.50 / 2.59 |
| Engine Wheelbase (ft / m) | 24 / 7.32 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.35 |
| Overall Wheelbase (engine & tender) (ft / m) | 47.29 / 14.41 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 20,160 / 9144 |
| Weight on Drivers (lbs / kg) | 58,000 / 26,308 |
| Engine Weight (lbs / kg) | 92,500 / 41,957 |
| Tender Loaded Weight (lbs / kg) | 51,000 / 23,133 |
| Total Engine and Tender Weight (lbs / kg) | 143,500 / 65,090 |
| Tender Water Capacity (gals / ML) | 25,000 / 94.70 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 32 / 16 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 20" / 381x508 |
| Tractive Effort (lbs / kg) | 13,909 / 6309.02 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.17 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 78 - 2" / 51 |
| Flues (number - dia) (in / mm) | 14 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 14.75 / 4.50 |
| Firebox Area (sq ft / m2) | 91 / 8.45 |
| Grate Area (sq ft / m2) | 26 / 2.42 |
| Evaporative Heating Surface (sq ft / m2) | 978 / 90.86 |
| Superheating Surface (sq ft / m2) | 203 / 18.86 |
| Combined Heating Surface (sq ft / m2) | 1181 / 109.72 |
| Evaporative Heating Surface/Cylinder Volume | 239.08 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4160 |
| Same as above plus superheater percentage | 4867 |
| Same as above but substitute firebox area for grate area | 17,035 |
| Power L1 | 9351 |
| Power MT | 1066.31 |