Ben H Morgan, Report on the Engineering Trades of South Africa (London: P S King & Son, 1902), , p. 67, accessed through [] and R H Clatworthy, "Beatty's Locomotives",accessed at [
]
Morgan notes that this design was under construction by an English builder, but gave no more context. Clatworthy fills in the facts that this pair was ordered by Hazlett M Beatty (Kitson works #4195-4196). Morgan's diagram shows 18.5" x 24" cylinders, but Locobase suspects they gained the half-inch before delivery.
Holland gives the boiler areas shown in the specs; earlier sources gave a total evaporative heating surface of 1,615 sq ft and 109 sq ft in the firebox.
They were small and low-drivered by CGR (and SAR) standards. Holland comments that the attempt to combine the good qualities of the Class 8s with a wide firebox did not ultimately succeed because of high maaintenance costs. It's also clear that these were among the few Mikados ever bought by the CGR or its successor, the South African Railways. They were never superheated.
A later locomotive - the 9th Class -- was an enlargement delivered by Kitson in 1906.
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | EXP4 |
Locobase ID | 9930 |
Railroad | Cape Government |
Country | South Africa |
Whyte | 2-8-2 |
Number in Class | 2 |
Road Numbers | 805-806 / 910-911 |
Gauge | 3'6" |
Number Built | 2 |
Builder | Kitson & Co |
Year | 1903 |
Valve Gear | Stephenson |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 13.33 / 4.06 |
Engine Wheelbase (ft / m) | 26.75 / 8.15 |
Ratio of driving wheelbase to overall engine wheelbase | 0.50 |
Overall Wheelbase (engine & tender) (ft / m) | 50.60 / 15.42 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 28,480 / 12,918 |
Weight on Drivers (lbs / kg) | 109,536 / 49,685 |
Engine Weight (lbs / kg) | 144,144 / 65,383 |
Tender Loaded Weight (lbs / kg) | 82,432 / 37,391 |
Total Engine and Tender Weight (lbs / kg) | 226,576 / 102,774 |
Tender Water Capacity (gals / ML) | 3426 / 12.98 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6.60 / 6 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 46 / 23 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 48 / 1219 |
Boiler Pressure (psi / kPa) | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 24" / 483x610 |
Tractive Effort (lbs / kg) | 27,617 / 12526.88 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.97 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 159 - 2.25" / 57 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 14.91 / 4.54 |
Firebox Area (sq ft / m2) | 117.30 / 10.90 |
Grate Area (sq ft / m2) | 26.75 / 2.49 |
Evaporative Heating Surface (sq ft / m2) | 1508 / 140.15 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 1508 / 140.15 |
Evaporative Heating Surface/Cylinder Volume | 191.47 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 4815 |
Same as above plus superheater percentage | 4815 |
Same as above but substitute firebox area for grate area | 21,114 |
Power L1 | 3830 |
Power MT | 308.34 |