Midland 4-4-0 Locomotives in New_Zealand

Class Details by Steve Llanso of Sweat House Media

Class La (Locobase 9569)

Data from Howell, Comparative Statistics of the Australasian Railways, Journal of the Royal Statistical Society, March 1899, pp. 98-99 and John Garner's [], last accessed 7 September 2008

This little tank quintet came from Nasmyth Wilson over a 5-year period (works #311, 315, 322, 323, 312, respectively) and were taken over in 1900 by the New Zealand Government.

When NZMR 2 was retired in 1920, it went to the Auckland Farmers Freezing Co. Ltd. in Moerewa until 1934. NZMR 5 went out of service in January 1926 and operated for the New Forest Sawmilling Company in Ngahere for another 24 years.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID9569
CountryNew Zealand
Number in Class5
Road Numbers310-314
Number Built5
BuilderNasmyth Wilson
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.13
Engine Wheelbase (ft / m)17.17 / 5.23
Ratio of driving wheelbase to overall engine wheelbase 0.41
Overall Wheelbase (engine & tender) (ft / m)17.17 / 5.23
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)39,872 / 18,086
Engine Weight (lbs / kg)59,584 / 27,027
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)59,584 / 27,027
Tender Water Capacity (gals / ML)780 / 2.95
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)33 / 16.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42.50 / 1080
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)12" x 18" / 305x457
Tractive Effort (lbs / kg)8294 / 3762.10
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.81
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)50 / 4.65
Grate Area (sq ft / m2)10.70 / 0.99
Evaporative Heating Surface (sq ft / m2)585 / 54.37
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)585 / 54.37
Evaporative Heating Surface/Cylinder Volume248.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1712
Same as above plus superheater percentage1712
Same as above but substitute firebox area for grate area8000
Power L14016
Power MT444.11

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