Portuguese Government 2-6-4 Locomotives in Portugal


Class Details by Steve Llanso of Sweat House Media

Class 070 (Locobase 9700)

Data from [link], last accessed 30 November 2008. See also "2-6-4 Tank Locomotives, Portuguese State Railways", Locomotive Magazine, Volume XXVII [27] (15 September 1921), pp. 223-224.

Wikipedia says that these were designed for the CP by Norwegian engineer Olaf Kjelberg and the prototype (070) was the only steam locomotive to be built in Portugal. They were intended for suburban use around Sintra and Azambuja. SLM of Winterthur, Henschel & Sohn, and Kassel contributed locomotives in this class over a 28-year period.

Once the lines were electrified in 1957, the class was retired.


Class 070 (Locobase 20827)

Data from [link], last accessed 30 November 2008. See also "2-6-4 Tank Locomotives, Portuguese State Railways", Locomotive Magazine, Volume XXVII [27] (15 September 1921), pp. 223-224.

Wikipedia says that these were designed for the CP by Norwegian engineer Olaf Kjelberg and the prototype (070) was the only steam locomotive to be built in Portugal; see Locobase 9700.

SLM of Winterthur, Henschel & Sohn, and Kassel contributed locomotives in this class over a 28-year period. The 1920 engines shown in this entry had uneven driver spacing with the first two axle centres just about 5" (actually 125 mm) farther apart at 1,1775 mm (69.89") than the second and third at 1,650 mm (64.96")..

CP 070s were intended for suburban use around Sintra and Azambuja, but also worked longer distances, such as the 213 miles (343 km) between Lisbon and Oporto.

Once the lines were electrified in 1957, the class was retired.

Principal Dimensions by Steve Llanso of Middle Run Media
Class070070
Locobase ID9700 20827
RailroadPortuguese GovernmentPortuguese Government
CountryPortugalPortugal
Whyte2-6-4T2-6-4T
Number in Class127
Road Numbers070071+
Gauge5'6"5'6"
Number Built127
BuilderOficina Gerans de CP, Lisboaseveral
Year19161916
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.24 / 3.42
Engine Wheelbase (ft / m)34.22 / 10.43
Ratio of driving wheelbase to overall engine wheelbase 0.33
Overall Wheelbase (engine & tender) (ft / m)34.22 / 10.43
Axle Loading (Maximum Weight per Axle) (lbs / kg) / 18,470
Weight on Drivers (lbs / kg)108,930 / 49,410
Engine Weight (lbs / kg)185,849 / 84,300181,881 / 82,500
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)2112 / 82640 / 10
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 4.40 / 4 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 / 152059.80 / 1520
Boiler Pressure (psi / kPa)171.10 / 1180174 / 1200
High Pressure Cylinders (dia x stroke) (in / mm)20.47" x 25.2" / 520x64020.47" x 25.2" / 520x640
Tractive Effort (lbs / kg)25,681 / 11648.7226,116 / 11846.03
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.17
Heating Ability
Tubes (number - dia) (in / mm)150 - 1.772" / 45 - 1.772" /
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)135.63 / 12.60
Grate Area (sq ft / m2)27.55 / 2.5627.23 / 2.53
Evaporative Heating Surface (sq ft / m2)1367 / 1271328 / 123.40
Superheating Surface (sq ft / m2)503 / 46.70
Combined Heating Surface (sq ft / m2)1367 / 1271831 / 170.10
Evaporative Heating Surface/Cylinder Volume142.42138.35
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation47144738
Same as above plus superheater percentage47146017
Same as above but substitute firebox area for grate area29,972
Power L111,803
Power MT716.64

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