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The reference for locomotives and railcars

New Zealand Railways class LA

New Zealand 1887 5 produced
LA 313 Albert Percy Godber

The five locomotives of the class LA were originally built between 1887 and 1892 for the New Zealand Midland Railway Company. As they were the first locomotives of this company, they had to haul all kinds of trains. They were tank locomotives with a 4-4-0T wheel arrangement and drivers of 42.5 inches. The cylinders measured twelve inches in diameter and 18 inches in stroke.

In 1900, the New Zealand Government Railways bought the Midland Railway and all their locomotives. There they received their class name LA, that was also applied to the 4-4-0T rebuilds of the L, although these had smaller drivers. The ex Midland locomotives were withdrawn between 1920 and 1928. Numbers 2 and 5, now 311 and 314, were sold to industrial operators and stayed in service until 1934 and 1950. Today 312 is in storage for a possible restoration.

Technical data

General

Built
1887-1892
Manufacturers
Nasmyth, Wilson & Co.
Wheel arrangement
4-4-0T (American)
Gauge
1,067 mm (Cape gauge)

Dimensions and weights

Length
7.98 m
Wheelbase
5.23 m
Service mass
27 t
Adhesion mass
18.1 t
Rigid wheelbase
2.13 m
Water capacity
2,956 l
Fuel capacity
0.9 t (coal)

Boiler

Grate area
0.994 m²
Firebox surface
4.645 m²
Tube heating surface
49.703 m²
Evaporative heating surface
54.348 m²
Total heating surface
54.3 m²

Power plant

Driver diameter
1,080 mm
Boiler pressure
11 bar
Expansion type
simple expansion
Cylinders
two, 305 x 457 mm

Power

Power source
steam
Estimated power
186 kW (253 PS)
Starting effort
36.9 kN

Calculated values

Factor of adhesion
1 : 4.81
Optimal speed
31 km/h
Power-to-weight ratio
6.9 kW/t
Heating Surface Equivalent
77.6 m²
Cylinder volume/HSE
1 : 860.09
Adhesive weight/Total
1 : 1.49
Tractive force/Heating surface
1 : 14.18
Grate area/Heating surface
1 : 54.68
Firebox/Tube surface
1 : 10.70
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