Ponferrada a Villablino 2-6-0 Locomotives in Spain

Class Details by Steve Llanso of Sweat House Media

Class 11 (Locobase 4912)

Using the Wilhelm Engerth patent that linked engine and tender together for increased adhesion, this design can be designated 2-6-0+4. The [] website notes that these engines were originally ordered by two Basque railways -- Elgoibar a San Sebastian and Ferrocarril Cantabrico (See Locobase 6331).. Richard von Helmholtz aimed for a design that would be much more powerful even while its dimensions remained essentially the same as earlier engines. Helmholtz used a bogie that combined the leading Bissel pony truck and the first driven axle.

And his design, says http://www.wefer ..., "era agil, capaz de remolcar trenes de viajeros a 60 km/h y capaz de inscribirse sin problemas en curvas de hasta 100 metros de radio." (Locobase's free translation: They were agile, capable of pulling a passenger train at 60 km/h [36 mph] and able to negotiate freely curves of less than 100 meters (328 ft) in radius.)

The PV mineral railroad began receiving used locomotives of this class in 1943 when the Basque railroads began electrifying. This entry refers to a set of four locomotives that the PV bought directly from the Macosa. The sandbox and steam dome were combined in a common casing.

Class 31 (Locobase 4913)

The PV mineral railroad began receiving used locomotives of the Engerth type in 1943 when the Basque railroads began electrifying. This one was built with slide valves and no superheating, which is reflected in the data. Sometime later, the engine was rebuilt with piston valves and superheating. She ran on the PV from 1943 to 1989.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID4912 4913
RailroadPonferrada a VillablinoPonferrada a Villablino
Number in Class41
Road Numbers13-1631
Number Built414
Valve GearHeusingerHeusinger
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)81,570 / 37,00076,500 / 34,700
Engine Weight (lbs / kg)102,514 / 46,50090,830 / 41,200
Tender Loaded Weight (lbs / kg)44,092 / 20,00043,431 / 19,700
Total Engine and Tender Weight (lbs / kg)146,606 / 66,500134,261 / 60,900
Tender Water Capacity (gals / ML)1584 / 61584 / 6
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 4.40 / 4 4.40 / 4
Minimum weight of rail (calculated) (lb/yd / kg/m)45 / 22.5043 / 21.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51.20 / 130051.20 / 1300
Boiler Pressure (psi / kPa)170.70 / 11.80170.70 / 11.80
High Pressure Cylinders (dia x stroke) (in / mm)17.72" x 23.62" / 450x60015.75" x 23.62" / 400x600
Tractive Effort (lbs / kg)21,018 / 9533.6216,604 / 7531.46
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.88 4.61
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)21.52 / 218.83 / 1.75
Evaporative Heating Surface (sq ft / m2)1115 / 103.621172 / 108.92
Superheating Surface (sq ft / m2)350 / 32.53
Combined Heating Surface (sq ft / m2)1465 / 136.151172 / 108.92
Evaporative Heating Surface/Cylinder Volume165.38220.04
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation36733214
Same as above plus superheater percentage45553214
Same as above but substitute firebox area for grate area
Power L1
Power MT

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