NZR WAB class |
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WAB 794 on its first excursion after restoration, with the Capital Connection rolling stock, on 31 August 2003. |
Type and origin |
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Power type | Steam |
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Builder | NZR Addington Workshops, Christchurch (1+1) NZR Hillside Workshops, Dunedin (12+8) A & G Price Limited, Thames (3+5) |
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Build date | 1939 |
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Specifications |
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Configuration:
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• Whyte | 4-6-4T |
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Gauge | 3 ft 6 in (1,067 mm) |
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Wheel diameter | 54 in (1.372 m)[1] |
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Wheelbase | 33 ft 1 in (10.08 m) |
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Length | 44 ft 6 in (13.56 m)[1] |
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Adhesive weight | 41.85 long tons (42.52 t; 46.87 short tons)[1] |
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Loco weight | 74 long tons (75 t; 83 short tons)[1] |
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Fuel type | Coal |
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Fuel capacity | 3.0 long tons (3.0 t; 3.4 short tons)[1] |
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Water cap. | 1,700 imp gal (7,700 L; 2,000 US gal)[1] |
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Firebox: | |
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• Grate area | 33.0 sq ft (3.07 m2)[1] |
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Boiler pressure | 200 psi (1,379 kPa)[1] |
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Heating surface | 1,050 sq ft (98 m2)[1] |
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Superheater:
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• Heating area | 183 sq ft (17.0 m2)[1] |
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Cylinders | Two[1] |
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Cylinder size | 17 in × 26 in (432 mm × 660 mm)[1] |
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Performance figures |
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Maximum speed | 60 mph (97 km/h) |
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Power output | 1,000 bhp (750 kW)[1] |
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Tractive effort | 22,250 lbf (99.0 kN)[1] |
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Career |
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Number in class | 30 (16 WAB+14 WS) |
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Numbers | 687 - 798 |
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Locale | All of New Zealand |
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First run | 1918 - 1926 |
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Retired | 1967 - 1972 |
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Scrapped | 1969 - 1972 |
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Current owner | Feilding and District Steam Rail Society (1) |
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Disposition | Scrapped, three preserved |
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The NZR WAB class locomotives were steam locomotives designed, built and used by New Zealand Railways Department (NZR). Their wheel arrangement is described by the Whyte notation 4-6-4T. The locomotives were designed by NZR chief draughtsman S.H. Jenkinson as tank versions of the AB class 4-6-2 Pacific locomotive. Initially, the locomotives were separated into two classes, designated WAB for mainline work and WS for suburban work.
The remaining locomotives were kept in service until the last days of steam, operating short-haul mainline freight services and fast suburban services, particularly in Auckland. WAB 794 was sold to the Ohai Railway Board in Southland for running heavy coal trains. The locomotives were progressively withdrawn in the 1960s.
Introduction
The first locomotives, WS 686 and WAB 687, were built from the boilers, frames and engine units initially destined for AB 666 and AB 667. These entered service in 1917, WS 686 in Wellington and WAB 687 at Taumarunui in the central North Island. Fourteen WS class locomotives were built between 1917 and 1925: one at Addington workshops (686), five at A & G Price Ltd, Thames (799-803) and eight at Hillside workshops, Dunedin (764-771). All the WS class were converted to WAB in 1932-4. Sixteen WAB class were built between 1918 and 1926: one at Addington (687), 12 at Hillside (786-795) and three at A&G Price (796-798). In July 1922[3] the class was introduced on Auckland (until 1930 at Waitematā) to Papakura suburban services.[4] Between 1947[5] and 1957, 11 WAB class were converted to AB class,[6] following Wellington electrification,[7] to reduce axle loads, for use on lighter lines.[8]
Preserved locomotives
Only three examples of the class remain, with two in their original form as WABs:
See also
References
Citations
- ^ a b c d e f g h i j k l m n "Wab794 - Technical Information". Feilding and District Steam Rail Society. Retrieved 26 October 2014.
- ^ "New locomotives. Evening Post". paperspast.natlib.govt.nz. 24 July 1922. Retrieved 20 June 2024.
- ^ "Improved facilities to Auckland's suburban railways". kura.aucklandlibraries.govt.nz. 10 August 1922. Retrieved 20 June 2024.
- ^ "New locomotives. Otago Daily Times". paperspast.natlib.govt.nz. 8 May 1947. Retrieved 20 June 2024.
- ^ "Ab... Made History. Press". paperspast.natlib.govt.nz. 26 August 1969. Retrieved 20 June 2024.
- ^ "FDSR - Wab794 Information". steamrail.org.nz. Retrieved 20 June 2024.
- ^ "First express ran seventy years ago. Press". paperspast.natlib.govt.nz. 6 September 1948. Retrieved 20 June 2024.
Bibliography
- Barry, Colin; Brouwer, John; Dash, Colin; Dickenson, Peter; Shalders, Bruce (1988). Cavalcade 125. Ferrymead 125 Committee. Retrieved 22 March 2019.
- Palmer, A. N.; Stewart, W. W. (1965). Cavalcade of New Zealand Locomotives. Wellington: A H. & A W. Reed. ISBN 978-0-207-94500-7.
External links
Wikimedia Commons has media related to NZR Wab class.
Rail vehicles of New Zealand
Diesel locomotives | |
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Electric locomotives | 1500 V DC | - EA (later EO of 1968)
- EC
- ED
- EO of 1923
- EW
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25 kV AC | |
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Battery | |
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Diesel multiple units | |
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Electric multiple units | |
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Railcars | RM class | - 88 seater (also known as Fiats or twinsets)
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Others | |
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Steam locomotives | - A of 1873
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- H
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Locomotive hauled carriages | |
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Track evaluation, cranes, and maintenance | |
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