C.F. Franco Ethiopien Beyer-Garratt Locomotives in Ethiopia


Class Details by Steve Llanso of Sweat House Media

Class 501 (Locobase 506)

Data from JP Crozet's Franco-Ethiopian Railway site, [], last accessed on 21 February 2009. Ansaldo works numbers 1371-1376.

These are the only Garratts Ansaldo built. Its exhaust stack was a Kylchap.

The tube heating surface area calculated from the inside diameters of 45 mm (1.77") for the tubes and 126 mm (4.96") for the flues was 1,277 sq ft (118.65 sq m) and a total heating surface area of 1,442 sq ft (134 sq m). That is the figure given in the source's diagram. Locobase's entry uses the outside diameters

The Ethiopian railways on which they ran were overseen by the Italian government, which had invaded Ethiopia in 1935. Only the first three in the Ansaldo order actually arrived in Ethiopia and, while they weren't as popular as the Mallets running in that country, they did carry on until 1959.

Principal Dimensions by Steve Llanso of Sweat House Media
Class501
Locobase ID506
RailroadC.F. Franco Ethiopien
CountryEthiopia
Whyte2-8-2+2-8-2
Number in Class3
Road Numbers501-503
Gauge95 cm
Number Built3
BuilderAnsaldo
Year1939
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.81 / 3.60
Engine Wheelbase (ft / m)15.52 / 4.73
Ratio of driving wheelbase to overall engine wheelbase 0.76
Overall Wheelbase (engine & tender) (ft / m)33.14 / 10.10
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)132,277 / 60,000
Engine Weight (lbs / kg)190,700 / 86,500
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)190,700 / 86,500
Tender Water Capacity (gals / ML)3168 / 12
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)5 / 5
Minimum weight of rail (calculated) (lb/yd / kg/m)28 / 14
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)41.30 / 1050
Boiler Pressure (psi / kPa)200.20 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)14.96" x 21.65" / 380x550 (4)
Tractive Effort (lbs / kg)39,929 / 18111.51
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.31
Heating Ability
Tubes (number - dia) (in / mm)119 - 1.969" / 50
Flues (number - dia) (in / mm)28 - 5.236" / 133
Flue/Tube length (ft / m)13.94 / 4.25
Firebox Area (sq ft / m2)164.90 / 15.80
Grate Area (sq ft / m2)32.29 / 3
Evaporative Heating Surface (sq ft / m2)1555 / 144.45
Superheating Surface (sq ft / m2)565 / 52.50
Combined Heating Surface (sq ft / m2)2120 / 196.95
Evaporative Heating Surface/Cylinder Volume176.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6464
Same as above plus superheater percentage8210
Same as above but substitute firebox area for grate area41,926
Power L111,677
Power MT1556.94

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