CF do Vale do Vouga 4-6-0 Locomotives in Portugal

Class Details by Steve Llanso of Sweat House Media

Class 121 (Locobase 9706)

Data from [], last accessed 30 November 2008.

These narrow-gauge tank engines served the Vale do Vouga area both before and after the formation of the CP in 1951. When the lines were closed in 1972, the engines were based at the Sernada depot, from which they were tranferred to Viseu. The last to retire was E 122 which left service on 24 April 1977. Only E 121 was scrapped; the others have all been preserved.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID9706
RailroadCF do Vale do Vouga
Number in Class4
Road Numbers21-24 / E 121-124
Number Built4
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)81,571 / 37,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)81,571 / 37,000
Tender Water Capacity (gals / ML)1109 / 4.20
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.30 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43.30 / 1100
Boiler Pressure (psi / kPa)169.70 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)14.17" x 19.69" / 360x500
Tractive Effort (lbs / kg)13,170 / 5973.82
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)58.10 / 5.40
Grate Area (sq ft / m2)13.77 / 1.28
Evaporative Heating Surface (sq ft / m2)785 / 73
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)785 / 73
Evaporative Heating Surface/Cylinder Volume218.43
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2337
Same as above plus superheater percentage2337
Same as above but substitute firebox area for grate area9860
Power L13665
Power MT

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