ADL/ADC class diesel multiple unit

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ADL/ADC class railcar
Refurbished ADC 855 at Britomart Transport Centre in 2006.
In serviceAustralia: 1982-1993,
New Zealand: 1993 to date
ManufacturerA Goninan & Co
Built atNewcastle
ReplacedNew Zealand: 56-foot carriages
Number built10 sets
Number in service10 sets
Fleet numbersADL 801–ADL 810
ADC 851–ADC 860
Operator(s)Transperth, Tranz Metro, Transdev Auckland
Depot(s)Westfield, Pukekohe
Line(s) servedSouthern Line (Papakura - Pukekohe)
Car body construction20.26 m (66 ft 6 in)
Train length42.20 m (138 ft 5 in)
Car length21.10 m (69 ft 3 in) over couplers
Width2.74 m (9 ft 0 in)
Height3.84 m (12 ft 7 in)
Floor height1.12 m (3 ft 8 in)
DoorsAir-operated sliding doors; two each side (four per car), 1.26 m (4 ft 2 in) wide
Maximum speed90 km/h (56 mph)
WeightADL: 42.97 tonnes (95,000 lb)
ADC: 35.75 tonnes (79,000 lb)
Prime mover(s)Cummins NT855 R4
Power outputADL: 2 x 205 kW (275 hp), one engine for each bogie
AuxiliariesADC: diesel alternator
Train heatingHeating & air conditioning
UIC classificationBo'Bo'+2'2'
Braking system(s)Electro-pneumatic
Coupling systemAustralia: Norwegian coupling
NZ: Kidney link & pin
Multiple workingWithin class only
Track gauge1,067 mm (3 ft 6 in)

The ADL class is a class of diesel multiple units operated by Transdev Auckland on the suburban rail network in Auckland, New Zealand. Originally built in the early 1980s by A Goninan & Co for Westrail of Western Australia, they were sold in 1993 by Westrail's successor, Transperth, to Tranz Rail. The units are currently owned by Auckland Transport.


Unrefurbished ADL 804 at Auckland Railway Station, prior to 2003
Refurbished ADL 802 at Westfield in October 2005.

Between 1982 and 1985, ten two-carriage stainless steel sets were manufactured for Transperth by A Goninan & Co, Newcastle.[1]

Following the electrification of the Perth rail network they were rendered surplus and in 1993 all were sold, along with the older ADK/ADB class, to New Zealand Rail to replace locomotive-hauled 56-foot carriages on suburban trains in Auckland.[1][2][3] The units arrived in Auckland from Perth in April 1993.[4] One unit went to Hutt Workshops in the winter of 1993 for staff familiarisation, while the other units were prepared for New Zealand service at Westfield locomotive depot.[4]

As a result of the units introduction, station platforms in Auckland needed to be raised.[2]

In October 1993, prior to New Zealand Rail being privatised, the company sold the class to the Auckland Regional Council.[2]


In 2002, the Auckland Regional Council funded an upgrade of the class, which included refurbishment of the interiors and painting in the new MAXX blue colour scheme. The first refurbished unit entered service in December 2002, the last in November 2003.[5]

In 2011, Auckland Transport indicated four two-car sets would be retained after the Auckland rail electrification project is completed.[6]

Due to the introduction of the AM class electric multiple unit on all of Auckland's suburban railway lines, the ADL/ADC units are now only used between Pukekohe and Papakura station as a shuttle service. This is due to that portion of the North Island Main Trunk not currently being electrified. In 2020 the government announced funding for electrification of this section,[7] which once completed will render the ADL/ADL DMUs surplus to requirements.

Notes and references[edit]

  1. ^ a b Gray, Bill; May, Andrew (2006). A History of WAGR Passenger Carriages. Perth: Bill Gray. pp. 319–323. ISBN 0-646-45902-3.
  2. ^ a b c Matt Lowrie (31 August 2017). "Twenty million trips! Auckland rail has come a long way in a very short time". The Spinoff. Retrieved 28 February 2019.
  3. ^ Churchman & Hurst 2001, p. 64.
  4. ^ a b Parsons 2002, p. 36.
  5. ^ "Auckland Regional Transport Authority (ARTA): 1 December 2004 – 31 October 2010" (PDF). Auckland Transport. 2010. Retrieved 28 February 2019.
  6. ^ "Electric trains: technical details". Auckland Transport Blog. Archived from the original on 11 October 2011. Retrieved 10 October 2011.
  7. ^ Jane Paterson (29 January 2020). "Govt's $12b infrastructure spend: Rail, roads and DHBs the big winners". Retrieved 29 January 2020.


External links[edit]

Media related to ADL/ADC class at Wikimedia Commons