C.F. L'Afrique Occidentale Beyer-Garratt Locomotives in Senegal_and_Ivory_Coast
Class Details by Steve Llanso of Sweat House Media
Class 93 (Locobase 740)
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. 104. Works numbers were 2715-2724 in 1938. Two more batches of the same design followed: 93.211-93.220 (2731-2740) in 1939 and 93.221-93.227 (2748-2754) in 1941.
Smaller Double Mountain Garratts headed for metre-gauge operation in West Africa. They hauled trains in Senegal (Dakar-NIger Line) and Ivory Coast (Abijan-Bobo Dioubasso Railway).
Durrant described them as "handsome engines ...noticeably from the same stable as the streamlined Algerian Garratts." Design details included a wood-burning Bekpaire firebox, skyline casing, and double chimneys (stack) mounted transversely (side by side) over the smokebox.
"Despite their small wheels," wrote Durrant, "speeds up to 62 mph [100 kph] were attained on trial." [Locobase notes that the 93s' drivers would have been turning at 408 rpm at that speed.] A 93 could move 400 tons of trailing load up 1 in 40 (2 1/2%) grades.
All the engines operating in Senegal ultimately ended up on Ivory Coast railways.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 93 |
| Locobase ID | 740 |
| Railroad | C.F. L'Afrique Occidentale |
| Country | Senegal and Ivory Coast |
| Whyte | 4-8-2+2-8-4 |
| Number in Class | 27 |
| Road Numbers | 93.201-210, 211.220, 221-227 |
| Gauge | Metre |
| Number Built | 27 |
| Builder | SA Franco-Belge, Raismes |
| Year | 1938 |
| 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) | 25,760 / 11,685 |
| Weight on Drivers (lbs / kg) | 206,080 / 93,476 |
| Engine Weight (lbs / kg) | 331,520 / 150,375 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 7392 / 28 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6.50 / 5.90 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 43 / 21.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 51 / 1295 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 24" / 432x610 (4) |
| Tractive Effort (lbs / kg) | 46,240 / 20974.14 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.46 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 186 / 17.28 |
| Grate Area (sq ft / m2) | 47 / 4.37 |
| Evaporative Heating Surface (sq ft / m2) | 1991 / 184.97 |
| Superheating Surface (sq ft / m2) | 258 / 23.97 |
| Combined Heating Surface (sq ft / m2) | 2249 / 208.94 |
| Evaporative Heating Surface/Cylinder Volume | 157.89 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9400 |
| Same as above plus superheater percentage | 10,434 |
| Same as above but substitute firebox area for grate area | 41,292 |
| Power L1 | 7068 |
| Power MT | 604.90 |