Data from 1947 Locomotive Cyclopedia (viewed 18 December 2004); supplemented by Ficha Technica de Locomotivas a Vapor, Caminhos de Ferro Portugueses; and "Locomotivas de Vapor de Via Larga"p. 74 , Posted by Guarda Freio at 18:01, 23 September 2018,, p.20 at
[], last accessed 25 January 2026 Works numbers were 4988-4993 in 1913, 5492 in 1914 and 5493 in 1915.
NB: If using the inside (fire side) diameter of 44 mm (1.73") in each tube, the tube heating surface measured 129.51 sq m (1,394 sq ft), which together with the firebox area, came to 1,526 sq ft of evaporative heating surface area. . Locobase uses the external diameters.
Data from 1947 Locomotive Cyclopedia (viewed 18 December 2004); supplemented by Ficha Technica de Locomotivas a Vapor, Caminhos de Ferro Portugueses; and "Locomotivas de Vapor de Via Larga"p. 34 , Posted by Guarda Freio at 18:01, 23 September 2018, at [], last accessed 25 January 2026 Works numbers in 73476-73495 in 1945
Essentially similar to the Indian State Railways AWD/CWD Mikados (Locobase 953) produced in the hundreds by Alco's Montreal Works and the Canadian Locomotive Company.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 051/0151 | 851 |
| Locobase ID | 21307 | 957 |
| Railroad | Companhia dos Caminhos de Ferro de Portugueses (CP) | Companhia dos Caminhos de Ferro de Portugueses (CP) |
| Country | Portugal | Portugal |
| Whyte | 2-8-2T | 2-8-2 |
| Number in Class | 8 | 20 |
| Road Numbers | 051-058/0158-0158 | 851-860, 1851-1856, 2851-2856/851-871 |
| Gauge | Via Larga | Via Larga |
| Number Built | 8 | 20 |
| Builder | Berliner Maschinenbau | Alco-Schenectady |
| Year | 1913 | 1944 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 17.22 / 5.25 | 15.75 / 4.80 |
| Engine Wheelbase (ft / m) | 33.63 / 10.25 | 32.74 / 9.98 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.51 | 0.48 |
| Overall Wheelbase (engine & tender) (ft / m) | 50.03 / 15.25 | 59.32 / 18.08 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 37,038 / 16,800 | |
| Weight on Drivers (lbs / kg) | 147,269 / 66,800 | 148,371 / 67,300 |
| Engine Weight (lbs / kg) | 193,566 / 87,800 | 206,904 / 93,850 |
| Tender Loaded Weight (lbs / kg) | 123,679 / 56,100 | |
| Total Engine and Tender Weight (lbs / kg) | 330,583 / 149,950 | |
| Tender Water Capacity (gals / ML) | 2112 / 8 | 5808 / 22 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.40 / 4 | 14.30 / 13 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 61 / 30.50 | 62 / 31 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 59.80 / 1520 | 60 / 1524 |
| Boiler Pressure (psi / kPa) | 173.30 / 1180 | 202.70 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 22.83" x 25.2" / 580x640 | 21" x 28" / 533x711 |
| Tractive Effort (lbs / kg) | 32,354 / 14675.54 | 35,458 / 16083.50 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.55 | 4.18 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 133 - 1.969" / 50 | 137 - 1.969" / 50 |
| Flues (number - dia) (in / mm) | 26 - 5" / 127 | 30 - 5.394" / 137 |
| Flue/Tube length (ft / m) | 14.76 / 4.50 | 17.49 / 5.33 |
| Firebox Area (sq ft / m2) | 132.40 / 12.30 | 145.31 / 13.50 |
| Grate Area (sq ft / m2) | 30.46 / 2.83 | 46.93 / 4.36 |
| Evaporative Heating Surface (sq ft / m2) | 1647 / 153.01 | 1951 / 181.25 |
| Superheating Surface (sq ft / m2) | 481 / 44.72 | 714 / 66.33 |
| Combined Heating Surface (sq ft / m2) | 2128 / 197.73 | 2665 / 247.58 |
| Evaporative Heating Surface/Cylinder Volume | 137.94 | 173.81 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 5279 | 9513 |
| Same as above plus superheater percentage | 6493 | 12,081 |
| Same as above but substitute firebox area for grate area | 28,222 | 37,407 |
| Power L1 | 9603 | 16,440 |
| Power MT | 575.03 | 977.12 |