Mcamedes Beyer-Garratt Locomotives in Angola


Class Details by Steve Llanso of Sweat House Media

Class 101 (Locobase 524)

Data from Gavin Hamilton's excellent compilation of Garratt data posted at []

(6 September 2005); and A[rthur] E[dward] Durrant, Garratt Locomotives of the World (revised edition) (Newton Abbott, UK: David & Charles, 1981), p. 172, 176. Works numbers 27000-27005 in 1953.

Durrant wrote that the Mocamedes originally operated on the 60 cm (23.62 in) gauge, but widened the gauge to the Cape size (1,067 mm/3 ft 6 in) in 1949. To handle the heavier (both in weight and in traffic levels) service demands, they bought these six Garratts. Such was their fidelity to the original concept, the Henschels strongly resembled the BP engines except for the round-topped boiler.

They opened the Cape Gauge lines in 1954 and hauled trains from newly expanded iron ore deposits in the mid-1960s. They had been placed in storage in 1974 not long before a Marxixt government came into power.

Principal Dimensions by Steve Llanso of Middle Run Media

Class101
Locobase ID524
RailroadMcamedes
CountryAngola
Whyte4-8-2+2-8-4
Number in Class6
Road Numbers101-106/701-706
Gauge3'6"
Number Built6
BuilderHenschel & Sohn
Year1953
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)29,568 / 13,412
Weight on Drivers (lbs / kg)236,320 / 107,193
Engine Weight (lbs / kg)310,912 / 141,027
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)310,912 / 141,027
Tender Water Capacity (gals / ML)6000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 6.60 / 6
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)204.50 / 14.10
High Pressure Cylinders (dia x stroke) (in / mm)18.5" x 24" / 470x610 (4)
Tractive Effort (lbs / kg)59,492 / 26985.15
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.97
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)229 / 21.27
Grate Area (sq ft / m2)51.60 / 4.79
Evaporative Heating Surface (sq ft / m2)2349 / 218.23
Superheating Surface (sq ft / m2)645 / 59.92
Combined Heating Surface (sq ft / m2)2994 / 278.15
Evaporative Heating Surface/Cylinder Volume157.30
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,552
Same as above plus superheater percentage12,874
Same as above but substitute firebox area for grate area57,133
Power L110,187
Power MT760.27

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