NZR class G (1937)

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NZR class G (1937)
Numbering: 95-100
Number: 6th
Manufacturer: Beyer-Peacock , NZR
Year of construction (s): 1937 (renovation)
Retirement: 1956
Type : 2'C1 'h3
Gauge : 1067 mm ( cape track )
Length over coupling: 19,647 mm
Service mass: 61.93 t
Service mass with tender: 100.1 t
Friction mass: 41.91 t
Wheel set mass : 14 t
Driving wheel diameter: 1447 mm
Cylinder diameter: 419 mm
Piston stroke: 610 mm
Boiler overpressure: 137.34 N / cm²
Grate area: 3.39 m²
Superheater area : 17 m²
Evaporation heating surface: 109.16 m²

The class G vehicles of the New Zealand Government Railways (NZR) built in 1937 were steam locomotives with a 2'C1 '( Pacific ) wheel arrangement . They were created by converting the engine frames from three Garratt locomotives built in 1928 (also class G ).

After the Garratt machines had been withdrawn from service after a few years of operation for various reasons, the drive frames were used in 1937 for the construction of six Pacific locomotives, with a new towing frame. The three-cylinder Gresley engine was retained. The boiler corresponded to that of the Ab class , but the chimney and dome were lower because of the higher boiler position. The locomotives received new cabs and Vanderbilt tenders .

The rebuilt locomotives were given track numbers 95 to 100, with numbers 98 to 100 being taken over from the Garratt locomotives. They were mainly used in freight traffic on the South Island , mainly on the Christchurch - Arthur's Pass route .

With the three-cylinder engine taken over by the Garratts unchanged, the locomotives had inherited the associated maintenance and adjustment problems, so that they were not very popular with the staff. The small number of units did not justify any further conversion, and the class was therefore retired in 1956, as the first main line series to be replaced by diesel locomotives.

No copy has survived.

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