page_title: New Zealand DX class locomotive
section_title: DXR class
hierarchical_section_title: New Zealand DX class locomotive / Rebuilds / DXR class
caption_attribution_description: English: KiwiRails DXR 8022 and DXB 5143 haul a container train from Picton to Christchurch. Pictured at Ethelton, New Zealand. Deutsch: DXR 8022 und DXB 5143 ziehen einen Containerzug von Picton nach Christchurch. Aufgenommen bei Ethelton, Neuseeland.
context_page_description: The New Zealand DX class locomotive is a type of 49 Co-Co diesel-electric locomotives that currently operate on New Zealand's national railway network. All locomotives are owned by KiwiRail.
  Built by GE Transportation in Erie, Pennsylvania, United States, they were introduced to New Zealand between 1972 and 1976. The class is based on the General Electric U26C model, a narrow-gauge version of the GE U23C model.
  The locomotives have seen several upgrades since their introduction and three sub-classes now exist: the DXB, DXC and DXR.
context_section_description: In 1993, New Zealand Rail Limited undertook a significant rebuilding of DX5362 into the first of what was to be a new sub-class, the DXR. DX5362 had been stored out of service at Hutt Workshops since early in 1989 suffering a cracked frame, and therefore was an ideal candidate for the rebuilding programme. Work began to fit the locomotive with a new 3,300 horsepower (2,500 kW) GE 7-FDL diesel engine, upgraded traction motors with a ratio of 5.17 to the then-standard DX ratio of 4.55, and a new design of "Universal Cab" with a shorter low hood and more angular appearance. The use of 'R' (like the DBR class) denotes that the new locomotive was a rebuilt DX.
  The newly rebuilt DX received the number DXR8007 when it entered service in 1993 along with the prototype DFT class rebuild, DFT7008. Initially, it was intended that New Zealand Rail would rebuild all of the DX class locomotives to DXR specifications similar to the programme of the rebuilding of the DF class into the DFT class, but after the privatisation of New Zealand Rail Limited (renamed Tranz Rail in 1995) later in 1993, the new management decided not to undertake further DX class rebuilds, due to the cost. One locomotive was however rebuilt to these original DXR specifications during the Tranz Rail years, DX5310 in 2001 for its return to service following its derailment at Pukehou while hauling the Bay Express in 1995. It did not though receive a new DXR style cab, so it retained its original DX classification until it was overhauled to DXC standards in 2010.
  Following the purchase of Tranz Rail by Toll in 2003, the new management authorised the rebuild of DX5235 - itself having been stored since being damaged in a collision in Christchurch in 2000 - which became DXR 8022. The new DXR featured minor differences in the carbody hood and a MkII version of the "Universal Cab" which was boxier than the previous MkI variant as applied to DXR8007. The new DXR rebuild was classified as DXR8022 and entered service in late 2005. It was decided to rebuild DXR8007 to match 8022 in the interests of standardisation, and so 8007 was again rebuilt at Hutt Workshops in 2006.
  Upon each rebuild, GE classified 8022 (and reclassified 8007) as model C30-8Mi. As rebuilt by New Zealand Rail, DXR8007 was classified by GE as their model C30-7M.
  In 2007, DXR8022 was one of the locomotives involved in a biofuel trial using a fuel mix of 5 per cent biodiesel and 95 per cent regular diesel over a period of six months. With the introduction of the DL class locomotives into service the two DXRs were transferred to the South Island, and are now used between Middleton and Picton.
  At 2,420 kilowatts (3,250 hp), the DXR class was the most powerful class of diesel-electric locomotive ever operated in New Zealand, until the introduction of the DL class in 2010, which surpassed the DXRs power output with 2,700 kilowatts (3,600 hp).
caption: DXR 8022 and DXB 5143 at Ethelton with a container train from Picton to Christchurch
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