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 | |
|---|---|
| Class | 101 |
| Locobase ID | 524 |
| Railroad | Mcamedes |
| Country | Angola |
| Whyte | 4-8-2+2-8-4 |
| Number in Class | 6 |
| Road Numbers | 101-106/701-706 |
| Gauge | 3'6" |
| Number Built | 6 |
| Builder | Henschel & Sohn |
| Year | 1953 |
| Valve Gear | Walschaert |
| 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 / 1410 |
| 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 Volume | 157.30 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 10,552 |
| Same as above plus superheater percentage | 12,874 |
| Same as above but substitute firebox area for grate area | 57,133 |
| Power L1 | 10,187 |
| Power MT | 760.27 |