Data from 1947 Locomotive Cyclopedia (viewed 18 December 2004). Works numbers in 73476-73495 in 1945
Essentially similar to the Indian State Railways Mike built by Montreal Locomotive Works and the Canadian Locomotive Company, but lacks a superheater.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 851 |
| Locobase ID | 957 |
| Railroad | Portuguese Government |
| Country | Portugal |
| Whyte | 2-8-2 |
| Number in Class | 22 |
| Road Numbers | 851-860, 1851-1856, 2851-2856/851-871 |
| Gauge | 5'6" |
| Number Built | 22 |
| Builder | Alco |
| Year | 1944 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 15.75 / 4.80 |
| Engine Wheelbase (ft / m) | 32.75 / 9.98 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.48 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 141,000 / 63,957 |
| Engine Weight (lbs / kg) | 195,500 / 88,677 |
| Tender Loaded Weight (lbs / kg) | 123,750 / 56,132 |
| Total Engine and Tender Weight (lbs / kg) | 319,250 / 144,809 |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 59 / 29.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 60 / 1524 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 21" x 28" / 533x711 |
| Tractive Effort (lbs / kg) | 34,986 / 15869.40 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.03 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 47 / 4.37 |
| Evaporative Heating Surface (sq ft / m2) | 2138 / 198.70 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 2138 / 198.70 |
| Evaporative Heating Surface/Cylinder Volume | 190.47 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9400 |
| Same as above plus superheater percentage | 9400 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |