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NZR JA class information


NZR JA class
JA 1271 with excursion consist on approach to Ahuriri on 14 February 2003.
Type and origin
Power typeSteam
BuilderNZR Hillside Workshops (35)
North British Locomotive Company (16)
Build date1946–1956
Specifications
Configuration:
 • Whyte4-8-2
Gauge3 ft 6 in (1,067 mm)
Wheel diameter54 in (1.372 m)
Wheelbase34 ft 10 in (10.62 m)
Length66 ft 11.5 in (20.41 m)
Adhesive weight44.45 long tons (45.16 t; 49.78 short tons)
Loco weight69.1 long tons (70.2 t; 77.4 short tons)
Tender weight40.35 long tons (41.00 t; 45.19 short tons)
Total weight109.45 long tons (111.21 t; 122.58 short tons)
Fuel typeCoal (Hillside)
Oil (North British)
Fuel capacity6.0 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 area39.0 square feet (3.6 m2)
Boiler pressure200 psi (1,400 kPa)
Feedwater heaterNone: Fitted with Davies & Metcalfe Exhaust Injector
Heating surface1,469 square feet (136.5 m2)
Superheater:
 • Heating area283 square feet (26.3 m2)
CylindersTwo
Cylinder size18 in × 26 in (457 mm × 660 mm)
Valve gearBaker
Performance figures
Maximum speed75 miles per hour (121 km/h)
Tractive effort24,960 lbf (111.0 kN)
Career
Number in class51
Numbers1240 – 1274 (Hillside)
1275 – 1290 (North British)
LocaleAll of New Zealand
First run1947 – 1956 (Hillside)
1952 (North British)
Last run16 November 1971
Retired1967–1971
Scrapped1969–1972
DispositionSeven 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.

  1. ^ Palmer & Stewart 1965, p. 123.

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