Nigeria Railways 4-8-0 Locomotives in Nigeria

Class Details by Steve Llanso of Sweat House Media

Class 154 (Locobase 20922)

Data from No. 34, "Goods Engine and Tender for the Nigerian Railways", Vulcan Foundry Locomotive Catalogue found on Flicker's Historical Locomotive Images website at [], last accessed 26 June 2021. See also D[ennis] Rock Carling, 4-8-0 Tender Locomotives (New York: Drake Publishers, Inc, 1972), p. 65 and serial 273 on table XB, pp.104-105. (Many thanks to Jorge Cerezo Toledo for his 26 June 2021 email containing links to several sites including the Vulcan Catalogue referred to above.) Works numbers were 3549-3551 in 1922.

Most of the NR Twelve-wheelers filled as much of the loading gauge as possible, but this light-rail version came in smaller and lighter. A Belpaire firebox was standard as was the Walschaert outside constant-lead radial valve gear.

The trio supported construction work on the NR, joining three built by North Briitish Locomotive Company in 1914. The six engines remained in service until retired (presumably one by one) between 1936 and 1950.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID20922
RailroadNigeria Railways
Number in Class3
Road Numbers154-156
Number Built3
BuilderVulcan Foundry
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)21.25 / 6.48
Ratio of driving wheelbase to overall engine wheelbase 0.56
Overall Wheelbase (engine & tender) (ft / m)42.92 / 13.08
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)69,440 / 31,497
Engine Weight (lbs / kg)91,840 / 41,658
Tender Loaded Weight (lbs / kg)56,000 / 25,401
Total Engine and Tender Weight (lbs / kg)147,840 / 67,059
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)29 / 14.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)17" x 21" / 432x533
Tractive Effort (lbs / kg)20,635 / 9359.89
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.37
Heating Ability
Tubes (number - dia) (in / mm)178 - 1.875" / 48
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.75 / 2.97
Firebox Area (sq ft / m2)100.50 / 9.34
Grate Area (sq ft / m2)15.84 / 1.47
Evaporative Heating Surface (sq ft / m2)952 / 88.44
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)952 / 88.44
Evaporative Heating Surface/Cylinder Volume172.56
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2534
Same as above plus superheater percentage2534
Same as above but substitute firebox area for grate area16,080
Power L12812
Power MT357.11

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