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 Middle Run Media | |
|---|---|
| Class | Vasco da Gama |
| Locobase ID | 15935 |
| Railroad | Trans-Zambezi |
| Country | Mozambique |
| Whyte | 4-8-0 |
| Number in Class | 2 |
| Road Numbers | 1-2 |
| Gauge | 3'6" |
| Number Built | 2 |
| Builder | Hawthorn Leslie |
| Year | 1922 |
| Valve Gear | Walschaert |
| 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 / 1210 |
| 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 Volume | 156.99 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3063 |
| Same as above plus superheater percentage | 3614 |
| Same as above but substitute firebox area for grate area | 23,128 |
| Power L1 | 7744 |
| Power MT | 864.87 |