Western Australia 4-4-4 Locomotives in Australia


Class Details by Steve Llanso of Sweat House Media

Class N (Locobase 9564)

Data from Howell, Comparative Statistics of the Australasian Railways, Journal of the Royal Statistical Society, March 1899, pp. 96-97.

As the Perth area's suburbs blossomed following the Gold Rush in Western Australia, these passenger tank engines served not just Perth, but also the gold center of Kalgoorlie. Several of the N class began service as O-class heavy freight engines; see Locobase 9565.

They proved to be a durable class and most operated into the 1950s with the last retiring in 1961.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassN
Locobase ID9564
RailroadWestern Australia
CountryAustralia
Whyte4-4-4T
Number in Class42
Road Numbers
Gauge3'6"
Number Built42
BuilderNeilson & Co
Year1896
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)99,008 / 44,909
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)99,008 / 44,909
Tender Water Capacity (gals / ML)1920 / 7.27
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 2.80 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)160 / 1100
High Pressure Cylinders (dia x stroke) (in / mm)15.5" x 21" / 394x533
Tractive Effort (lbs / kg)14,295 / 6484.11
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)93 / 8.64
Grate Area (sq ft / m2)15.75 / 1.46
Evaporative Heating Surface (sq ft / m2)867 / 80.58
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)867 / 80.58
Evaporative Heating Surface/Cylinder Volume189.04
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2520
Same as above plus superheater percentage2520
Same as above but substitute firebox area for grate area14,880
Power L13718
Power MT

All material Copyright © SteamLocomotive.com
Wes Barris