NZR B class (1874)

Specifications
Specifications
Configuration:;
• Whyte	0-4-4-0T (Double Fairlie)
Gauge	3 ft 6 in (1,067 mm)
Driver dia.	3 ft 3 in (0.991 m)
Length	31 ft 2 in (9.50 m)
Loco weight	28 long tons 0 cwt (62,700 lb or 28.4 t); 28 long tons 0 hundredweight (28.4 t; 31.4 short tons)
Fuel capacity	1 long ton 14 cwt (3,800 lb or 1.7 t); 1 long ton 14 hundredweight (1.7 t; 1.9 short tons)
Water cap.	750 imp gal (3,400 L; 900 US gal)
Firebox:
• Grate area	15.0 sq ft (1.39 m2)
Boiler pressure	130 lbf/in2 (900 kPa)
Heating surface	770 sq ft (72 m2)
Cylinders	4
Cylinder size	9 in × 16 in (229 mm × 406 mm)

NZR B class (1874)
NZR B class (1874)
	Snake, a 0-4-4-0T Double Fairlie, B class steam locomotive "B" 238
Power type
Type and origin
Power type	Steam
Builder	Avonside Engine Co., UK
Build date	1874
Total produced	2
Configuration:;
Specifications
Configuration:;
• Whyte	0-4-4-0T (Double Fairlie)
Gauge	3 ft 6 in (1,067 mm)
Driver dia.	3 ft 3 in (0.991 m)
Length	31 ft 2 in (9.50 m)
Loco weight	28 long tons 0 cwt (62,700 lb or 28.4 t); 28 long tons 0 hundredweight (28.4 t; 31.4 short tons)
Fuel capacity	1 long ton 14 cwt (3,800 lb or 1.7 t); 1 long ton 14 hundredweight (1.7 t; 1.9 short tons)
Water cap.	750 imp gal (3,400 L; 900 US gal)
Firebox:
• Grate area	15.0 sq ft (1.39 m2)
Boiler pressure	130 lbf/in2 (900 kPa)
Heating surface	770 sq ft (72 m2)
Cylinders	4
Cylinder size	9 in × 16 in (229 mm × 406 mm)
Tractive effort
Performance figures
Tractive effort	6,912 lbf (30.75 kN)
Operators
Career
Operators	NZGR
Numbers	10, 27
First run	1874-1875
Withdrawn	1890–1896
Disposition	Both scrapped

The NZR B class of 1874 was the first of two steam locomotive classes to be designated as B by the Railways Department that then oversaw New Zealand's national rail network (the second B class was introduced in 1899). Ordered from the Avonside Engine Company in 1874, the locomotives were of the Double Fairlie type and were the first British-built locomotives to feature Walschaerts valve gear. They were not the first Double Fairlies to operate in New Zealand, as the first two members of the E class had commenced operations in 1872.