CEMR 4-8-4 Locomotives in Spain

Class Details by Steve Llanso of Sweat House Media

Class 203 (Locobase 4848)

Data from [] . Works numbers were 20053 in 1929, 22474 in 1934, and 23278 in 1936.

This Northern tank is probably the tank engine confrere of the Mikado tender engines delivered several years earlier. Like the Mikes, these Belpaire-boiler locomotives had a minimum curve radius was 90 metres, probably because the first and last driving axles were allowed considerable lateral movement.

They probably used the same boiler, although Locobase can't confirm that. All had a maximum speed of 40 kmh (25 mph).

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID4848
Number in Class3
Road Numbers203-205
Number Built
BuilderHenschel & Sohn
Valve GearWalschaert
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)125,663 / 57,000
Engine Weight (lbs / kg)191,802 / 87,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)191,802 / 87,000
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)52 / 26
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)41.70 / 1060
Boiler Pressure (psi / kPa)171.10 / 11.80
High Pressure Cylinders (dia x stroke) (in / mm)20.47" x 21.26" / 520x540
Tractive Effort (lbs / kg)31,069 / 14092.68
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04
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)34.44 / 3.20
Evaporative Heating Surface (sq ft / m2)
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5893
Same as above plus superheater percentage5893
Same as above but substitute firebox area for grate area
Power L1
Power MT

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