Trans-Zambezi Railway Beyer-Garratt Locomotives in Mozambique
Class Details by Steve Llanso of Sweat House Media
Class E (Locobase 718)
Data from Wiener (1930); and "Trans-Zambezi Railway, Design No. 1125", Beyer-Garrrat Patent Articulated Locomotives (Manchester, England: Beyer-Peacock & Company Limited, 1931), archived on flickr's Historical Railway Images at [
], et seq, p. 47.). See also "Pioneering in Nyasaland" archived at Mike's Railway History, last accessed 3 January 2015.
These Prairie Garratts took on passenger service of 7 cars totalling 270 tons up 2 1/2 grades from the Rhodesia Railways junction at Dondo to the Zambezi River opposite Chindio on 60 lb/yard (30 kg/metre) rail. They were delivered with deep, wood-burning fireboxes, but were soon modified for coal burning.
1927-era examples had a higher boiler, Hendrie bypass valves on the cylinders. Adhesive weight was 147,280 lb (FofA 4.08) and weight in service was 223,216 lb.
New Cape Central Railway locomotives (Locobase 747) and a Natal Navigation Collery engine (Locobase 20932) were virtually identical.
Data from Gavin Hamilton's excellent compilation of Garratt data posted at []
(accessed 6 September 2005) shows 271 sq ft for the superheater for a total of 1,958 sq ft of CHS.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | E |
| Locobase ID | 718 |
| Railroad | Trans-Zambezi Railway |
| Country | Mozambique |
| Whyte | 2-6-2+2-6-2 |
| Number in Class | 2 |
| Road Numbers | 5-6, |
| Gauge | 3'6" |
| Number Built | 2 |
| Builder | Beyer, Peacock |
| Year | 1924 |
| Valve Gear | |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 16 / 4.88 |
| Engine Wheelbase (ft / m) | 35.33 / 10.77 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.45 |
| Overall Wheelbase (engine & tender) (ft / m) | 63.25 / 19.28 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 23,520 / 10,669 |
| Weight on Drivers (lbs / kg) | 141,008 / 63,960 |
| Engine Weight (lbs / kg) | 211,360 / 95,871 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 211,360 / 95,871 |
| Tender Water Capacity (gals / ML) | 4200 / 15.91 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 10.10 / 9.20 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 39 / 19.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42.80 / 1087 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 22" / 381x559 (4) |
| Tractive Effort (lbs / kg) | 35,390 / 16052.65 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.98 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 225 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | 24 - 5.5" / 140 |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 157 / 14.59 |
| Grate Area (sq ft / m2) | 33.90 / 3.15 |
| Evaporative Heating Surface (sq ft / m2) | 1687 / 156.73 |
| Superheating Surface (sq ft / m2) | 293 / 27.22 |
| Combined Heating Surface (sq ft / m2) | 1980 / 183.95 |
| Evaporative Heating Surface/Cylinder Volume | 187.46 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 6102 |
| Same as above plus superheater percentage | 7017 |
| Same as above but substitute firebox area for grate area | 32,499 |
| Power L1 | 7289 |
| Power MT | 683.77 |