Data from [], last accessed 30 November 2008; and "Locomotivas de Vapor de Via Larga"p.19 , posted Posted by Guarda Freio at 18:01, 23 September 2018, at [], last accessed 25 January 2026. See also "2-6-4 Tank Locomotives, Portuguese State Railways", Locomotive Magazine, Volume XXVII [27] (15 September 1921), pp. 223-224. SLM works numbers were 2564-2568 in 1916 and 2720-2729 in 1920. Henschel works numbers were 21312-21323 in 1929.
Wikipedia says Norwegian engineer Olaf Kjelberg designed these for the CP by Norwegian engineer Olaf Kjelberg and the prototype (070) was the only steam locomotive to be built in Portugal. Five years later, the CP ordered five from the Swiss builder SLM. Apparently satisfied with the result, the railway bought ten more in 1920. Another nine years before Henschel delivered the biggest order of 12.
They were intended for suburban use around Sintra and Azambuja.
Once the CP electrified the commuter lines in 1957, the railway decommissioned the class.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 070 |
| Locobase ID | 9700 |
| Railroad | Companhia dos Caminhos de Ferro de Portugueses (CP) |
| Country | Portugal |
| Whyte | 2-6-4T |
| Number in Class | 28 |
| Road Numbers | 070-097 |
| Gauge | Via Larga |
| Number Built | 28 |
| Builder | Oficina Gerans de CP, Lisboa |
| Year | 1916 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11.24 / 3.42 |
| Engine Wheelbase (ft / m) | 44 / 13.41 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.26 |
| Overall Wheelbase (engine & tender) (ft / m) | 44 / 13.41 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 109,129 / 49,500 |
| Engine Weight (lbs / kg) | 185,849 / 84,300 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2112 / 8 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.40 / 4 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 61 / 30.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 59.80 / 1520 |
| Boiler Pressure (psi / kPa) | 173.30 / 1180 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20.47" x 25.2" / 520x640 |
| Tractive Effort (lbs / kg) | 26,011 / 11798.41 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.20 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 112 - 1.969" / 50 |
| Flues (number - dia) (in / mm) | 28 - 5" / 127 |
| Flue/Tube length (ft / m) | 14.11 / 4.30 |
| Firebox Area (sq ft / m2) | 149.19 / 13.86 |
| Grate Area (sq ft / m2) | 27.56 / 2.56 |
| Evaporative Heating Surface (sq ft / m2) | 1481 / 137.59 |
| Superheating Surface (sq ft / m2) | 503 / 46.70 |
| Combined Heating Surface (sq ft / m2) | 1984 / 184.29 |
| Evaporative Heating Surface/Cylinder Volume | 154.29 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4776 |
| Same as above plus superheater percentage | 5970 |
| Same as above but substitute firebox area for grate area | 32,318 |
| Power L1 | 12,153 |
| Power MT | 736.54 |