Data from "Tank Locomotive, Nigeria Rys", Locomotive Magazine (15 September 1928), p. 277. (Many thanks to Teemu Koivumaki for his 19 August 2024 email supplying key information for several Nigerian Railways classes.) Works numbers were 2307-2312 in July-September 1927 and 2332-2337 in April 1928
LM said that Mr MP Sells, then-Chief Mechanical Engineer of the Nigerian Railways, had issued the requirements for this duodecade of six-coupled shunters.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 25 |
| Locobase ID | 21196 |
| Railroad | Nigeria Railways |
| Country | Nigeria |
| Whyte | 0-6-0T |
| Number in Class | 12 |
| Road Numbers | 25-36 |
| Gauge | 3'6" |
| Number Built | 12 |
| Builder | WG Bagnall |
| Year | 1927 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12 / 3.66 |
| Engine Wheelbase (ft / m) | 12 / 3.66 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 12 / 3.66 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 76,720 / 34,800 |
| Engine Weight (lbs / kg) | 76,720 / 34,800 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 840 / 3.18 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 43 / 21.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42.75 / 1086 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 23" / 381x584 |
| Tractive Effort (lbs / kg) | 16,463 / 7467.50 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.66 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 12.75 / 1.18 |
| Evaporative Heating Surface (sq ft / m2) | 774 / 71.91 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 774 / 71.91 |
| Evaporative Heating Surface/Cylinder Volume | 164.53 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2040 |
| Same as above plus superheater percentage | 2040 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |