Zafra a Huelva 0-6-0 Locomotives in Spain


Class Details by Steve Llanso of Sweat House Media

Class 21/030-2251 (Locobase 3432)

Data from [], the web site of the Spanish National Railway (link no longer active; see [], last accessed 26 December 2022. See also Justo Arenillas in "La material ingles en las pequenas companias", Lineas Del Tren (as reproduced on [], viewed 28 April 2003). Works numbers 1844-1853 in July 1886.

These ten six-couples were part of a three-design deal with Dubs & Co when the railway opened.

See Locobase 3335 for an account of the origins and rationale for the Zafra y Huelva.

Principal Dimensions by Steve Llanso of Sweat House Media

Class21/030-2251
Locobase ID3432
RailroadZafra a Huelva
CountrySpain
Whyte0-6-0
Number in Class10
Road Numbers21-30/030-2251-2260
Gauge5'6"
Number Built10
BuilderDubs & Co
Year1886
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.99 / 3.35
Engine Wheelbase (ft / m)10.99 / 3.35
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)33.14 / 10.10
Axle Loading (Maximum Weight per Axle) (lbs / kg)29,696 / 13,470
Weight on Drivers (lbs / kg)89,067 / 40,400
Engine Weight (lbs / kg)89,067 / 40,400
Tender Loaded Weight (lbs / kg)46,958 / 21,300
Total Engine and Tender Weight (lbs / kg)136,025 / 61,700
Tender Water Capacity (gals / ML)1848 / 7
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 5.50 / 5
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)149.40 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)17.99" x 24.02" / 457x610
Tractive Effort (lbs / kg)20,567 / 9329.05
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.33
Heating Ability
Tubes (number - dia) (in / mm)164 - 1.969" / 50
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.81 / 4.21
Firebox Area (sq ft / m2)100.21 / 9.31
Grate Area (sq ft / m2)16.36 / 1.52
Evaporative Heating Surface (sq ft / m2)1297 / 120.46
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1297 / 120.46
Evaporative Heating Surface/Cylinder Volume183.54
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2444
Same as above plus superheater percentage2444
Same as above but substitute firebox area for grate area14,971
Power L13041
Power MT225.82

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