Data from "Pacific Type Locomotives, Nigerian Railways", The Locomotive, Volume XXXIII [33], No. 413 (15 January 1927). See also "Africa Railways - Nigeria Railways - NR 4-6-2 steam locomotive Nr. 412 EMIR OF KAIAMA (Nasmyth Wilson 1534 / 1928): on Flickr's Historical Railway Images photostream at [], last accessed 25 August 2024. (Thanks to Teemu Koivumaki for his 19 August 2024 email supplying key information for several Nigerian Railways classes.) Works numbers 1471-1476 in 1926 nd 1493-1496 in 1928.
LM's report certainly told the truth in describing these Pacifics as "powerful". Their particulars also show many of the features available in late -era steam locomotives. Designed for the 700-mile (1,126 km) Lagos-Kano mainline passenger service, 405s hauled optimistically named North Mail and Boat Express trains at an average speed of 22 mph (35 kph).
As diesels began taking over mainline passenger service in the mid-1950s, the 405s migrated to secondary lines where they operated into the 1970s.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 405 |
| Locobase ID | 21194 |
| Railroad | Nigerian Railways |
| Country | Nigeria |
| Whyte | 4-6-2 |
| Number in Class | 10 |
| Road Numbers | 405-414 |
| Gauge | 3'6" |
| Number Built | 10 |
| Builder | Nasmyth Wilson |
| Year | 1926 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11.50 / 3.51 |
| Engine Wheelbase (ft / m) | 28.67 / 8.74 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.40 |
| Overall Wheelbase (engine & tender) (ft / m) | 52.79 / 16.09 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 28,672 / 13,005 |
| Weight on Drivers (lbs / kg) | 61,667 / 27,972 |
| Engine Weight (lbs / kg) | 135,901 / 61,644 |
| Tender Loaded Weight (lbs / kg) | 70,829 / 32,128 |
| Total Engine and Tender Weight (lbs / kg) | 206,730 / 93,772 |
| Tender Water Capacity (gals / ML) | 3600 / 13.64 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 8.25 / 7.50 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 34 / 17 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 60 / 1524 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 26" / 457x660 |
| Tractive Effort (lbs / kg) | 21,481 / 9743.63 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 2.87 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 132 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | 21 - 5.25" / 133 |
| Flue/Tube length (ft / m) | 12 / 3.66 |
| Firebox Area (sq ft / m2) | 165 / 15.33 |
| Grate Area (sq ft / m2) | 19.80 / 1.84 |
| Evaporative Heating Surface (sq ft / m2) | 1237 / 114.92 |
| Superheating Surface (sq ft / m2) | 236 / 21.92 |
| Combined Heating Surface (sq ft / m2) | 1473 / 136.84 |
| Evaporative Heating Surface/Cylinder Volume | 161.54 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3564 |
| Same as above plus superheater percentage | 4134 |
| Same as above but substitute firebox area for grate area | 34,452 |
| Power L1 | 9840 |
| Power MT | 1055.35 |