Data from "Sierra Leone Government Railways-Design 1111", Beyer-Garrrat Patent Articulated Locomotives (Manchester, England: Beyer-Peacock & Company Limited, 1931), archived on flickr's Historical Railway Images at [], et seq, p. 19.
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 . Works numbers were 7707-7726 in 1955-1956
Principal Dimensions by Steve Llanso of Sweat House Media | ||
---|---|---|
Class | 50 | 63 |
Locobase ID | 741 | 743 |
Railroad | Sierra Leone Government Rly | Sierra Leone Government Rly |
Country | Sierra Leone | Sierra Leone |
Whyte | 2-6-2+2-6-2 | 4-8-2+2-8-4 |
Number in Class | 13 | 14 |
Road Numbers | 50-52 | 63-76 |
Gauge | 2'6" | 2'6" |
Number Built | 13 | 14 |
Builder | Beyer, Peacock | Beyer, Peacock |
Year | 1926 | 1955 |
Valve Gear | Walschaert | Walschaert |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 12 / 3.66 | 18.80 / 5.73 |
Engine Wheelbase (ft / m) | 27.50 / 8.38 | |
Ratio of driving wheelbase to overall engine wheelbase | 0.44 | |
Overall Wheelbase (engine & tender) (ft / m) | 43.33 / 13.21 | 64.63 / 19.70 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 11,200 / 5080 | 11,200 / 5080 |
Weight on Drivers (lbs / kg) | 67,312 / 30,532 | 89,600 / 40,642 |
Engine Weight (lbs / kg) | 104,496 / 47,399 | 148,512 / 67,364 |
Tender Loaded Weight (lbs / kg) | ||
Total Engine and Tender Weight (lbs / kg) | 104,496 / 47,399 | 148,512 / 67,364 |
Tender Water Capacity (gals / ML) | 1440 / 5.45 | 1920 / 7.27 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.30 / 3 | 4.40 / 4 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 19 / 9.50 | 19 / 9.50 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 28 / 711 | 33 / 838 |
Boiler Pressure (psi / kPa) | 175 / 12.10 | 175 / 12.10 |
High Pressure Cylinders (dia x stroke) (in / mm) | 10" x 16" / 254x406 (4) | 12.63" x 16" / 321x406 (4) |
Tractive Effort (lbs / kg) | 17,000 / 7711.08 | 23,009 / 10436.72 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.96 | 3.89 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 124 - 1.875" / 48 | |
Flues (number - dia) (in / mm) | 15 - 5.5" / 140 | |
Flue/Tube length (ft / m) | ||
Firebox Area (sq ft / m2) | 76.50 / 7.11 | 95 / 8.83 |
Grate Area (sq ft / m2) | 18.20 / 1.69 | 22.50 / 2.09 |
Evaporative Heating Surface (sq ft / m2) | 724 / 67.26 | 924 / 85.84 |
Superheating Surface (sq ft / m2) | 120 / 11.15 | 178 / 16.54 |
Combined Heating Surface (sq ft / m2) | 844 / 78.41 | 1102 / 102.38 |
Evaporative Heating Surface/Cylinder Volume | 248.89 | 199.13 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 3185 | 3938 |
Same as above plus superheater percentage | 3631 | 4568 |
Same as above but substitute firebox area for grate area | 15,262 | 19,285 |
Power L1 | 6139 | 6225 |
Power MT | 1206.40 | 1225.34 |