NZR WAB class

From Wikipedia, the free encyclopedia
  (Redirected from NZR Wab class)
Jump to: navigation, search
NZR WAB class
WAB 794 train near Woodville.jpg
WAB 794 on its first excursion after restoration, with the Capital Connection rolling stock
Type and origin
Power type Steam
Builder NZR Addington Workshops, Christchurch (1+1)
NZR Hillside Workshops, Dunedin (12+8)
A & G Price Limited, Thames (3+5)
Build date 1939
Specifications
Configuration 4-6-4T
Gauge 3 ft 6 in (1,067 mm)
Wheel diameter 54 in (1.372 m)[1]
Wheelbase 33 ft 1 in (10.08 m)
Length 44 ft 6 in (13.56 m)[1]
Weight on drivers 41.85 long tons (42.52 t; 46.87 short tons)[1]
Locomotive weight 71.5 long tons (72.6 t; 80.1 short tons)[1]
Fuel type Coal
Fuel capacity 3.0 long tons (3.0 t; 3.4 short tons)[1]
Water capacity 1,700 imp gal (7,700 L; 2,000 US gal)[1]
Boiler pressure 200 psi (1,379 kPa)[1]
Firegrate area 33.0 sq ft (3.07 m2)[1]
Heating surface:
– Total
1,050 sq ft (98 m2)[1]
Superheater area 183 sq ft (17.0 m2)[1]
Cylinders Two[1]
Cylinder size 17 in × 26 in (432 mm × 660 mm)[1]
Performance figures
Maximum speed 60 mph (97 km/h)
Power output 1,000 bhp (750 kW)[1]
Tractive effort 22,250 lbf (99.0 kN)[1]
Career
Number in class 30 (16 WAB+14 WS)
Number(s) 687 - 798
Locale All of New Zealand
First run 1918 - 1926
Retired 1967 - 1972
Scrapped 1969 - 1972
Current owner Feilding and District Steam Rail Society (1)
Disposition Withdrawn, 2 preserved

The WAB class locomotives were steam locomotives designed, built and used by New Zealand Railways Department. 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 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). Between 1947 and 1957 11 WAB class were converted to AB class.

The remaining locomotives were kept in service until the last days of steam, operating short-haul main line 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.

Preserved locomotives[edit]

Only three examples of the class remain, with two in their original form as WABs.

WAB 794 is preserved at Feilding, and has been used on main line excursions and also on the regular Wellington - Auckland Overlander service.

WAB (former WS) 800 is owned by the Waikato Branch of New Zealand Railway and Locomotive Society and was stored for many years at the Te Awamutu Railway Museum. Following negotiation of a lease agreement, the engine has been moved to the Glenbrook Vintage Railway for eventual restoration to working order.

AB (former WAB) 795 is preserved at Kingston, for use on the "Kingston Flyer".

Class register[edit]

Key: In service Out of service Auckland Transport service Preserved Overhaul/Repair Scrapped
Number Builder Introduced[2] Withdrawn[2] Notes
686 NZR Addington April 1917 January 1966
687 NZR Addington April 1917 January 1966
763 NZR Hillside May 1923 April 1963
764 NZR Hillside July 1923 July 1963
765 NZR Hillside August 1923 April 1963
766 NZR Hillside September 1923 May 1964
767 NZR Hillside November 1923 April 1963
768 NZR Hillside January 1924 April 1963
769 NZR Hillside May 1924 April 1963
770 NZR Hillside May 1924 September 1962
771 NZR Hillside July 1924 September 1962
772 NZR Hillside July 1924 September 1962
786 NZR Hillside July 1926 September 1947 Converted to AB class; withdrawn October 1968
787 NZR Hillside August 1926 October 1947 Converted to AB class; withdrawn April 1966
788 NZR Hillside September 1926 January 1948 Converted to AB class; withdrawn March 1969
789 NZR Hillside October 1926 August 1947 Converted to AB class; withdrawn March 1969
790 NZR Hillside December 1926 September 1957 Converted to AB class; withdrawn February 1966
791 NZR Hillside December 1926 November 1947 Converted to AB class; withdrawn October 1967
792 NZR Hillside March 1927 June 1947 Converted to AB class; withdrawn July 1969
793 NZR Hillside March 1927 February 1948 Converted to AB class; withdrawn March 1969
794 NZR Hillside May 1927 31 August 1955 Sold to Ohai Railway Board; withdrawn 1968.
Preserved by Feilding and District Steam Rail Society, operating with mainline certification
795 NZR Hillside May 1927 December 1947 Converted as AB class; withdrawn July 1969
Preserved (as AB) by Kingston Flyer
796 A & G Price September 1926 September 1962
797 A & G Price September 1926 May 1963
798 A & G Price November 1926 March 1969 Rebuilt as AB class 11-1957
799 A & G Price November 1927 April 1969
800 A & G Price November 1927 April 1969 Stored at Glenbrook Vintage Railway.
801 A & G Price November 1927 April 1969
802 A & G Price November 1927 April 1969
803 A & G Price November 1927 April 1969 Rebuilt as AB class 12-1957.

See also[edit]

References[edit]

  1. ^ 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. 
  2. ^ a b "Wab Class 4-6-4T Register". Retrieved 2009-07-03. 

External links[edit]