NZR G class (1928)

Specifications
Specifications
Configuration:;
• Whyte	Garratt: 4-6-2+2-6-4
Driver dia.	57 in (1.448 m)
Length	84 ft 3.75 in (25.70 m)
Width	8 ft 6 in (2.59 m)
Height	11 ft 6 in (3.51 m)
Adhesive weight	87.7 long tons (98.2 short tons; 89.1 t)
Loco weight	146.8 long tons (164.4 short tons; 149.2 t)
Firebox:
• Grate area	58.2 sq ft (5.41 m2)
Boiler pressure	200 psi (1.4 MPa)
Heating surface	2,223 sq ft (206.5 m2)
Cylinders	6
Cylinder size	16.5 in × 24 in (419 mm × 610 mm)

Type and origin
Type and origin
Power type	Steam
Builder	Beyer, Peacock & Company
Serial number	6484–6486
Build date	1928

NZR G class (1928)
NZR G class (1928)
	A G class locomotive in Garratt form.
Power type
Type and origin
Power type	Steam
Builder	Beyer, Peacock & Company
Serial number	6484–6486
Build date	1928
Configuration:;
Specifications
Configuration:;
• Whyte	Garratt: 4-6-2+2-6-4
Driver dia.	57 in (1.448 m)
Length	84 ft 3.75 in (25.70 m)
Width	8 ft 6 in (2.59 m)
Height	11 ft 6 in (3.51 m)
Adhesive weight	87.7 long tons (98.2 short tons; 89.1 t)
Loco weight	146.8 long tons (164.4 short tons; 149.2 t)
Firebox:
• Grate area	58.2 sq ft (5.41 m2)
Boiler pressure	200 psi (1.4 MPa)
Heating surface	2,223 sq ft (206.5 m2)
Cylinders	6
Cylinder size	16.5 in × 24 in (419 mm × 610 mm)
Tractive effort
Performance figures
Tractive effort	51,580 lbf (229.44 kN)
Operators
Career
Operators	New Zealand Government Railways
Number in class	3
Numbers	98–100
First run	1928
Last run	1931
Preserved	0
Disposition	Withdrawn

NZR G class (1937)

Type and origin
Builder	Hillside Workshops
Build date	1937

Specifications
Configuration:
• Whyte	4-6-2
Driver dia.	57 in (1.448 m)
Total weight	99.5 long tons (111.4 short tons; 101.1 t)
Firebox:
• Grate area	36.5 sq ft (3.39 m²)
Boiler pressure	180 psi (1.2 MPa)
Heating surface	1,175 sq ft (109.2 m²)
Cylinders	3
Cylinder size	16.5 in × 24 in (419 mm × 610 mm)

Performance figures
Tractive effort	25,800 lbf (114.76 kN)

Career
Number in class	6
Numbers	95–100
Last run	1956

The NZR G class was a type of Garratt locomotives used in New Zealand, later rebuilt as Pacific type locomotives. They were the only Garratt type steam locomotives ever used by the New Zealand Railways (NZR). They were ordered to deal with traffic growth over the heavy gradients of the North Island Main Trunk (NIMT) and to do away with the use of banking engines on steep grades. They were one of the few Garratt designs to employ six cylinders. A mechanical stoker was used to feed coal into the locomotive. The locomotives lasted longer in rebuilt form as standard Pacific locomotives than they did as Garratts, but their numerous mechanical issues lead to their final withdrawal following a union ban on their use in 1956.