NZR A class (1906)

Specifications
Specifications
Configuration:;
• Whyte	4-6-2
Gauge	1,067 mm (3 ft 6 in)
Driver dia.	54 in (1.372 m)
Length	57 ft 2 in (17.42 m)
Adhesive weight	33 long tons 2 cwt (74,100 lb or 33.6 t)
Loco weight	51 long tons 0 cwt (114,200 lb or 51.8 t) ; 55 long tons 0 cwt (123,200 lb or 55.9 t)(simple)
Tender weight	25 long tons 10 cwt (57,100 lb or 25.9 t)
Fuel type	Coal
Fuel capacity	4 long tons 0 cwt (9,000 lb or 4.1 t)
Water cap.	1,700 imp gal (7,700 L; 2,000 US gal)
Firebox:
• Grate area	30 sq ft (2.8 m2)
Boiler pressure	225 psi (1,551 kPa) (as coumpound); 190 psi (1,310 kPa)(simple)
Heating surface	1,724 sq ft (160.2 m2)
Cylinders	2 HP, 2 LP
Cylinder size	18 in × 22 in (457 mm × 559 mm)(simple)
High-pressure cylinder	12 in × 22 in (305 mm × 559 mm)
Low-pressure cylinder	19 in × 22 in (483 mm × 559 mm)

Type and origin
Type and origin
Power type	Steam
Builder	Addington Workshops (8),; A & G Price (50)
Build date	1906–1914
Total produced	58

NZR A class (1906)
NZR A class (1906)
	NZR A class 428 at Glenmark Station in Waipara, 2016.
Power type
Type and origin
Power type	Steam
Builder	Addington Workshops (8),; A & G Price (50)
Build date	1906–1914
Total produced	58
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-2
Gauge	1,067 mm (3 ft 6 in)
Driver dia.	54 in (1.372 m)
Length	57 ft 2 in (17.42 m)
Adhesive weight	33 long tons 2 cwt (74,100 lb or 33.6 t)
Loco weight	51 long tons 0 cwt (114,200 lb or 51.8 t) ; 55 long tons 0 cwt (123,200 lb or 55.9 t)(simple)
Tender weight	25 long tons 10 cwt (57,100 lb or 25.9 t)
Fuel type	Coal
Fuel capacity	4 long tons 0 cwt (9,000 lb or 4.1 t)
Water cap.	1,700 imp gal (7,700 L; 2,000 US gal)
Firebox:
• Grate area	30 sq ft (2.8 m2)
Boiler pressure	225 psi (1,551 kPa) (as coumpound); 190 psi (1,310 kPa)(simple)
Heating surface	1,724 sq ft (160.2 m2)
Cylinders	2 HP, 2 LP
Cylinder size	18 in × 22 in (457 mm × 559 mm)(simple)
High-pressure cylinder	12 in × 22 in (305 mm × 559 mm)
Low-pressure cylinder	19 in × 22 in (483 mm × 559 mm)
Tractive effort
Performance figures
Tractive effort	17,000 lbf (76 kN) (as compound); 20,060 lbf (89.2 kN)(simple)
Operators
Career
Operators	NZGR
Withdrawn	1954–1969
Preserved	Two: 423, 428
Disposition	Two preserved, remainder scrapped

The NZR A class were a class of steam locomotives built in 1906 with a 4-6-2 wheel arrangement for the New Zealand Railways Department (NZR). The class should not be confused with the older and more obscure A class of 1873. They were designed by the NZR's Chief Mechanical Engineer, A. L. Beattie and his Chief Draughtsman, G. A. Pearson to replace less powerful locomotives struggling with increasing loads on the South Island Main Trunk Railway, and in anticipation of the traffic volumes that would be created upon the completion of the North Island Main Trunk railway.