Data from locomotive diagrams published on [] and 1941 Index of Diagrams of Steam Locomotives. See also Cdr J Plomer, "A Long Line of Mountains",
Data from A E Durrant, The Smoke that Thunders (Harare, Zimbabwe: African Publishing Group, 1997), pp. 10-11. Works numbers 5160-5163 in 1897.
Produced at the same time as the three Class 6B Ten-wheelers shown in Locobase 16122, these Twelve-wheelers originally were intended as well for the Bechuanaland Railway in what became Rhodesia and arrived in Cape Town as their 4-7. The boiler was about the same size, the grate a little bigger than the Class 6, but the extra axle spread the weight over more wheels and the Class 7s had significantly lower axle loadings. Durrant explains that all four were taken into the CGR as part of their Class 7 and numbered 347-350. 4 and 6-7 received CGR numbers and were reboilered (Locobase 10540), but the 348 was sold to the Paulings construction company, which built the Rhodesia Katanga Junction Railway. Paulings already owned another Class 7 from the CGR (ex-398). After its completion in 1909, the RKJ bought the 348 and 398. Both operated in northern Rhodesia until the late 1920s, when 398 was sold back to Paulings to support branch-line construction. 348 was withdrawn in January 1932, 398 in October 1933. Both were scrapped in March 1938.
Data from locomotive diagrams published on [] . See also long article in Locomotive Magazine: "New Engines for the Cape Government Railway", Vol IX (28 November 1903), p. 313; and South African Railways and Harbours 8 - 1941 Locomotive Diagram book supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange.
Data from locomotive diagrams published on [] . See also long article in Locomotive Magazine: "New Engines for the Cape Government Railway", Vol IX (28 November 1903), p. 313.
Principal Dimensions by Steve Llanso of Sweat House Media | ||||
---|---|---|---|---|
Class | 1/1A - Hendrie B | 7B/7C - superheated | 8, 8A, 8B, 8C, 8D, 8E, 85 | 8/8A-8D - superheated |
Locobase ID | 4379 | 16127 | 10415 | 4381 |
Railroad | Natal Government (SAR) | Cape Government (SAR) | Cape Government Railways (SAR) | South African Railways (SAR) |
Country | South Africa | South Africa | South Africa | South Africa |
Whyte | 4-8-0 | 4-8-0 | 4-8-0 | 4-8-0 |
Number in Class | 71 | 14 | 174 | 23 |
Road Numbers | 275-324 | 401-440, 471-500, 829-838/1069-1243 | 1069-1091 | |
Gauge | 3'6" | 3'6" | 3'6" | 3'6" |
Number Built | 71 | 174 | ||
Builder | North British | SAR | several | several |
Year | 1904 | 1935 | 1902 | 1929 |
Valve Gear | Walschaert | Stephenson | Stephenson | Walschaert |
Locomotive Length and Weight | ||||
Driver Wheelbase (ft / m) | 12.75 / 3.89 | 12 / 3.66 | 13.50 / 4.11 | 13.50 / 4.11 |
Engine Wheelbase (ft / m) | 22.50 / 6.86 | 21.27 / 6.48 | 23.25 / 7.09 | 23.25 / 7.09 |
Ratio of driving wheelbase to overall engine wheelbase | 0.57 | 0.56 | 0.58 | 0.58 |
Overall Wheelbase (engine & tender) (ft / m) | 49.05 / 14.95 | 46.17 / 14.07 | 46.87 / 14.29 | 46.87 / 14.29 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 32,928 / 14,936 | 21,728 / 9856 | 26,432 / 11,989 | 26,880 / 12,193 |
Weight on Drivers (lbs / kg) | 126,448 / 57,356 | 85,120 / 38,610 | 104,832 / 47,551 | 107,520 / 48,770 |
Engine Weight (lbs / kg) | 158,032 / 71,682 | 109,984 / 49,888 | 131,712 / 59,744 | 136,080 / 61,725 |
Tender Loaded Weight (lbs / kg) | / 33,480 | 76,384 / 34,647 | 81,648 / 37,035 | 96,432 / 43,741 |
Total Engine and Tender Weight (lbs / kg) | 186,368 / 84,535 | 213,360 / 96,779 | 232,512 / 105,466 | |
Tender Water Capacity (gals / ML) | 3675 / 13.92 | 3120 / 11.82 | 3426 / 12.98 | 3000 / 11.36 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 9.60 / 9 | 6.05 / 6 | 8.20 / 8 | 11 / 10 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 53 / 26.50 | 35 / 17.50 | 44 / 22 | 45 / 22.50 |
Geometry Relating to Tractive Effort | ||||
Driver Diameter (in / mm) | 46 / 1168 | 42.75 / 1086 | 48 / 1219 | 48 / 1219 |
Boiler Pressure (psi / kPa) | 190 / 13.10 | 180 / 12.40 | 180 / 12.40 | 180 / 12.40 |
High Pressure Cylinders (dia x stroke) (in / mm) | 20.5" x 24" / 521x610 | 17.5" x 23" / 445x584 | 18.5" x 24" / 470x610 | 19" x 24" / 483x610 |
Tractive Effort (lbs / kg) | 35,411 / 16062.18 | 25,209 / 11434.62 | 26,182 / 11875.97 | 27,617 / 12526.88 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.57 | 3.38 | 4.00 | 3.89 |
Heating Ability | ||||
Tubes (number - dia) (in / mm) | 325 - 2" / 51 | 100 - 1.875" / 48 | 205 - 2" / 51 | 115 - 2" / 51 |
Flues (number - dia) (in / mm) | 18 - 5.5" / 140 | 18 - 5.5" / 140 | ||
Flue/Tube length (ft / m) | 12.09 / 3.69 | 10.75 / 3.28 | 11.04 / 3.36 | 11.04 / 3.36 |
Firebox Area (sq ft / m2) | 132 / 12.27 | 102 / 9.48 | 125.50 / 11.66 | 131 / 12.17 |
Grate Area (sq ft / m2) | 34 / 3.16 | 18 / 1.67 | 21.30 / 1.98 | 21.30 / 1.98 |
Evaporative Heating Surface (sq ft / m2) | 2188 / 203.35 | 919 / 85.38 | 1320 / 122.63 | 1081 / 100.43 |
Superheating Surface (sq ft / m2) | 206 / 19.14 | 214 / 19.88 | ||
Combined Heating Surface (sq ft / m2) | 2188 / 203.35 | 1125 / 104.52 | 1320 / 122.63 | 1295 / 120.31 |
Evaporative Heating Surface/Cylinder Volume | 238.64 | 143.53 | 176.78 | 137.26 |
Computations Relating to Power Output (More Information) | ||||
Robert LeMassena's Power Computation | 6460 | 3240 | 3834 | 3834 |
Same as above plus superheater percentage | 6460 | 3823 | 3834 | 4486 |
Same as above but substitute firebox area for grate area | 25,080 | 21,665 | 22,590 | 27,589 |
Power L1 | 4525 | 6576 | 3756 | 6696 |
Power MT | 315.57 | 681.28 | 315.96 | 549.19 |