JA 1271 with excursion consist on approach to Ahuriri on 14 February 2003.
Type and origin
Power type
Steam
Builder
NZR Hillside Workshops (35) North British Locomotive Company (16)
Build date
1946–1956
Specifications
Configuration:
• Whyte
4-8-2
Gauge
3 ft 6 in (1,067 mm)
Wheel diameter
54 in (1.372 m)
Wheelbase
34 ft 10 in (10.62 m)
Length
66 ft 11.5 in (20.41 m)
Adhesive weight
44.45 long tons (45.16 t; 49.78 short tons)
Loco weight
69.1 long tons (70.2 t; 77.4 short tons)
Tender weight
40.35 long tons (41.00 t; 45.19 short tons)
Total weight
109.45 long tons (111.21 t; 122.58 short tons)
Fuel type
Coal (Hillside) Oil (North British)
Fuel capacity
6.0 long tons (6.1 t; 6.7 short tons) coal 1,350 imp gal (6,100 L; 1,620 US gal) oil
Water cap.
4,000 imp gal (18,000 L; 4,800 US gal)
Firebox:
• Grate area
39.0 square feet (3.6 m2)
Boiler pressure
200 psi (1,400 kPa)
Feedwater heater
None: Fitted with Davies & Metcalfe Exhaust Injector
Heating surface
1,469 square feet (136.5 m2)
Superheater:
• Heating area
283 square feet (26.3 m2)
Cylinders
Two
Cylinder size
18 in × 26 in (457 mm × 660 mm)
Valve gear
Baker
Performance figures
Maximum speed
75 miles per hour (121 km/h)
Tractive effort
24,960 lbf (111.0 kN)
Career
Number in class
51
Numbers
1240 – 1274 (Hillside) 1275 – 1290 (North British)
Locale
All of New Zealand
First run
1947 – 1956 (Hillside) 1952 (North British)
Last run
16 November 1971
Retired
1967–1971
Scrapped
1969–1972
Disposition
Seven preserved, remainder scrapped
The NZR JA class was a class of fifty-one 4-8-2 steam locomotives operated by the New Zealand Railways Department (NZR). The locomotives were built in two batches; the first batch was constructed in-home at the Hillside Workshops at Dunedin between 1946 and 1956, while the second batch was produced by the North British Locomotive Company (NBL) of Glasgow, Scotland in 1951. To differentiate between the two batches, the locomotives were identified by their builder.[1]
The JA class was the last steam locomotive class to be produced by the NZR, with the Hillside-built JA 1274 being the final steam locomotive ever built. The North British JAs were also the last steam locomotives imported for the NZR.
The JA class had relatively short service lives of between 12 and 24 years as they were replaced by diesel locomotives as part of the dieselisation process of the NZR. Nine JAs managed to last until the end of steam on 26 October 1971.
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displaced in the North Island. The last steam locomotive to be built by NZR, JA 1274, was introduced into service in December 1956, and by 1967, steam...
traction which began in the mid 1950s and continued until 1971 when the last JAclass locomotives were withdrawn from the Main South Line. In addition at this...
Railways Department (NZR J class); some of which were later converted to JB class oilburners. In 1951 NBL supplied another 16 JAclass, though these did...
various operators connecting to the national rail network: Similar to the NZR DS class: Drewry 2248/1947 was built for the Ohai Railway Board as their NO 1...
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the members who also worked on NZR at the time. The whole project was repeated the following year when sister WW class locomotive 644 ran the same journey...
on New Zealand's railway network. The carriages generally replaced older NZR 56-foot carriages, some of which had been in use for almost 70 years. The...
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Timaru and Arthurs Pass double-heading with the Glenbrook Vintage Railway's JA 1250. Depots operated by the Trust included Parnell, (Auckland) Middleton...
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