Data from D[ennis] Rock Carling, 4-8-0 Tender Engines (New York: Drake Publishers, Inc, 1972), pp. 63 and serial 166, Table X [10] B, pp.104.
Both the Lagos Railway and the Baro-Kano Railways ordered satrurated-boiler Twelve wheelers in 1908. Both were closely derived from the Cape 7th class (Locobase 16128). The big difference, wrote Carling, was the use of large Belpaire fireboxes and grates in place of the South African round-tops.
About 25 years later in 1934, the Nigerian Railways fitted superheated boilers to two of them; see Locobase 20842. The other ten were retired in the same year.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Modified Cape CSAR 7th Class |
| Locobase ID | 20841 |
| Railroad | Lagos and Baro-Kano railways |
| Country | Nigeria |
| Whyte | 4-8-0 |
| Number in Class | 11 |
| Road Numbers | 244-254 |
| Gauge | 3'6" |
| Number Built | 11 |
| Builder | North British |
| Year | 1908 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12 / 3.66 |
| Engine Wheelbase (ft / m) | 21.29 / 6.49 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.56 |
| Overall Wheelbase (engine & tender) (ft / m) | 44 / 13.41 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 84,448 / 38,305 |
| Engine Weight (lbs / kg) | 107,744 / 48,872 |
| Tender Loaded Weight (lbs / kg) | 56,339 / 25,555 |
| Total Engine and Tender Weight (lbs / kg) | 164,083 / 74,427 |
| Tender Water Capacity (gals / ML) | 2400 / 9.09 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.85 / 3.50 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 35 / 17.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42.75 / 1086 |
| Boiler Pressure (psi / kPa) | 170 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 23" / 432x584 |
| Tractive Effort (lbs / kg) | 22,468 / 10191.33 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.76 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 112 / 10.41 |
| Grate Area (sq ft / m2) | 17.50 / 1.63 |
| Evaporative Heating Surface (sq ft / m2) | 1088 / 101.08 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1088 / 101.08 |
| Evaporative Heating Surface/Cylinder Volume | 180.06 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2975 |
| Same as above plus superheater percentage | 2975 |
| Same as above but substitute firebox area for grate area | 19,040 |
| Power L1 | 3304 |
| Power MT | 345.02 |