Trans-Zambezi 4-8-0 Locomotives in Mozambique


Class Details by Steve Llanso of Sweat House Media

Class Vasco da Gama (Locobase 15935)

Data from "New Locomotives for the Trans-Zambezi Railway", The Locomotive, Volume XXVIII [28] (15 February 1922), pp. 28-29. See also "100 Years of the Railway," The Eye--The Insider's Guide to Malawi archived at [], last accessed 3 January 2015.

These Twelve-wheelers were repeats of the Shire Highlands locomotives of Nyasaland shown in Locobase 20071. The newer engines were bought to support the new railway then under construction ran parallel to the Indian Ocean from the port of Beira and crossing the Zambezi at Chinde (Chindio) into Nyasaland (the colonial name for Malawi).

They too had the Belpaire firebox, relatively small cylinder volume (for a Cape Gauge 4-8-0), and small drivers.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassVasco da Gama
Locobase ID15935
RailroadTrans-Zambezi
CountryMozambique
Whyte4-8-0
Number in Class2
Road Numbers1-2
Gauge3'6"
Number Built2
BuilderHawthorn Leslie
Year1922
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)21.33 / 6.50
Ratio of driving wheelbase to overall engine wheelbase 0.56
Overall Wheelbase (engine & tender) (ft / m)45.74 / 13.94
Axle Loading (Maximum Weight per Axle) (lbs / kg)19,964 / 9056
Weight on Drivers (lbs / kg)78,960 / 35,816
Engine Weight (lbs / kg)107,532 / 48,776
Tender Loaded Weight (lbs / kg)74,956 / 34,000
Total Engine and Tender Weight (lbs / kg)182,488 / 82,776
Tender Water Capacity (gals / ML)3000 / 13.64
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 9.50 / 9
Minimum weight of rail (calculated) (lb/yd / kg/m)33 / 16.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)175 / 12.10
High Pressure Cylinders (dia x stroke) (in / mm)18" x 21" / 457x533
Tractive Effort (lbs / kg)21,085 / 9564.01
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.74
Heating Ability
Tubes (number - dia) (in / mm)112 - 1.875" / 48
Flues (number - dia) (in / mm)18 - 5.25" / 133
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)112 / 10.41
Grate Area (sq ft / m2)17.50 / 1.63
Evaporative Heating Surface (sq ft / m2)971 / 90.21
Superheating Surface (sq ft / m2)210 / 19.51
Combined Heating Surface (sq ft / m2)1181 / 109.72
Evaporative Heating Surface/Cylinder Volume156.99
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3063
Same as above plus superheater percentage3614
Same as above but substitute firebox area for grate area23,128
Power L17744
Power MT864.87

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