New Zealand DF class locomotive (1979)

New Zealand DF / DFT class (General Motors)

DFT 7295 departing the Ashburton yard, 20 February 2013. Note the enlarged driver's side windscreen.
Type and origin
Power type Diesel-Electric
Builder General Motors Diesel (GMD), Canada (builder)
Tranz Rail (rebuilder)
Model DF EMD GL22MC
DFT EMD GT22MC
Build date 1979 - 1981
1992 - 1997 (rebuilt as DFT class)
Specifications
UIC class Co-Co
Gauge 3 ft 6 in (1,067 mm)
Length 16.7 metres (54 ft 9 in)
Adhesive weight 86 tonnes (85 long tons; 95 short tons)
Loco weight 86 tonnes (85 long tons; 95 short tons)
Prime mover GM 12-645E (DF)
GM 12-645E3C (DFT)
RPM range 900 rpm
Engine type V12 Diesel engine
Aspiration Roots-type supercharger (DF)
Turbocharger (DFT)
Displacement 126.84 litres (7,740 cu in)
Traction motors Six D29cc
Cylinders 12
Cylinder size 230 mm × 254 mm (9.1 in × 10.0 in)
Performance figures
Maximum speed 113 km/h (70 mph)
Power output 1,230 kW (1,650 hp) DF
1,800 kW (2,400 hp) DFT
Tractive effort 198 kN (45,000 lbf)
Career
Number in class 30
Numbers 1651 - 1670[n 1] (original DF)
6006 - 6317 (TMS DF)
7008 - 7348 (DFT)
Locale All of New Zealand
First run 1979
Disposition 11 DFTs and 12 DFBs in service
7 withdrawn

The New Zealand DF class locomotive of 1979 is a class of 30 Co-Co diesel-electric locomotives built by General Motors Diesel of Canada between 1979 and 1981. Between 1992 and 1997, all the locomotives were rebuilt as the DFT class, a turbocharged version of the DF.

The class should not be confused with the English Electric NZR DF class of 1954; as all of the old DFs had been retired by mid-1975, the 'DF' classification was free to be re-used.

Design

The DFs were powered by an EMD 12-645 engine, the same prime mover chosen for the DC class, but were able to make greater use of that power by having six traction motors and Co-Co arrangement as opposed to the four traction motors and A1A-A1A wheel arrangement of the DCs. This gave the DF several advantages: a tractive effort of 198 kN (45,000 lbf) and a maximum speed of 113 km/h (70 mph), compared to the DCs 140 kN (31,000 lbf) and 90–100 km/h (56–62 mph). The most noticeable visual difference between the DF and the DC is that the DF is considerably longer with the headlight arrangement on the cabs differing: the DC has the lights arranged horizontally, while the DF has them arranged vertically. The DF is more often confused with the DX class, as both are of similar dimensions though the DX also has the horizontal headlight arrangement.

In service

History

DFT 7145 in Ahuriri Yard, Napier - 8 June 2003.

The first 20 members of the DF class arrived in New Zealand in 1979, and initially ten worked on the East Coast Main Trunk, Kinleith, Rotorua and Murupara Branches, making use of the recently opened Kaimai Tunnel; and ten worked freight trains on the Main North Line between Christchurch and Picton. At the time, they were the most powerful locomotives in the South Island, with a total power output of 1,230 kilowatts (1,650 hp).

The next ten DFs arrived in 1981 and were also sent to work in the Bay of Plenty, and some to supplement the South Island fleet, which by this time had also entered service on the Main South Line and Midland Line as far as Arthur's Pass.

In 1986 the DF fleet was reallocated, concentrating 22 of the class in the South Island, and reallocating the remaining eight North Island DFs from Hamilton to Wellington, for use between Wellington and Gisborne, on the Wairarapa Line and Palmerston North - Gisborne Line (PNGL).

In 1988, the fleet was again reallocated due to the opening of the NIMT electrification, with approximately 20 DFs based in Auckland for use in Northland, and between Auckland, Hamilton and the ECMT and its branches. The remaining units were based in the South Island. This removed the DFs from the lower North Island - Gisborne routes, and reduced the number in the South Island.

Rebuilding to DFT

DFT 7295 in Dunedin in former Tranz Rail "Bumble Bee" colours.

The main downside to the DF was the lack of power output from the diesel engine. This hindered the DF when it came to hauling heavy freight trains out of multiple.

In 1992, DF 6260 was rebuilt with a new turbocharged diesel engine and some other minor alterations. The rebuilt DF was reclassified DFT (the T standing for turbocharged), and renumbered 7008.

After 18 months of trial, the decision was made to convert the remaining 29 DFs to DFTs, with the last unit converted in 1997. The turbocharged locos can now generate 1,800 kW (2,400 hp), and now comfortably fits between the DC class and the DX class in terms of power output.

Current

DFTs 7023 and 7036 approaching Ashburton with a freight train, 12 March 2014.

The class remains predominantly employed on general freight duties on all routes nationwide, with the general exception of through trains on the NIMT and the Midland Line coal workings. The units operate both in multiple with the other mainline locomotive classes, or as single units, depending on availability and the level of motive power required. The units also see use on the KiwiRail Scenic Journeys passenger services, particularly the Northern Explorer. Since July 2015, they have been the main motive power on the Wairarapa Connection passenger service and Masterton to Wellington freight services, replacing the DC class.[1] Being such handy units this class sees far more inter-island transfers than the other classes. In 2015 DFB 7241 was reallocated to the South Island for trial testing on the TranzAlpine, with DFB 7239 following in early 2016.

Auckland Transport service

DFB 7010 at Morningside station
DFB 7010 at Morningside station with a 6-car SA set

Three DFTs/DFBs were in service in Auckland hauling six-car SA trains on the Auckland suburban network, leased by Auckland Transport. These trains were made up of ex-British Rail Mark 2 carriages, rebuilt for use on Auckland commuter trains. Most were in four- or five-car configurations with a DC class locomotive. The locomotives used on 6-car SA sets were DFBs 7010, 7200 and 7348, and DFT 7104. These began service on 20 September 2010 with the introduction of a new timetable. DFB 7010 was released back to KiwiRail in November 2012 leaving three units operating. Other DFTs have been assigned periodically to cover for when these units undergo maintenance, with DFT 7051 and DFB 7186 most recently filling this role during the 2011 Rugby World Cup when extra six-car trains were in use.

Numbering

In common with NZR practice at the time the class was numbered with reference to the power output (1,650 hp), with the first 20 units numbered 1651 to 1670. With the introduction of the TMS system in 1980 these locomotives were renumbered in order with new four digit numbers starting with 6 in which the last number acted as a check number; DF 1651 became DF 6006 and DF 1670 becoming DF 6202. The second batch all received TMS numbers while under construction. They were then renumbered again when rebuilt to DFT standard in the 7xxx series, with these numbers allocated as they were rebuilt with no reference to their previous number.

Vision upgrades

Prior to the rebuilding to DFT standard, the locomotives received an upgrade in the late 1980s with the introduction of single-manning to improve visibility for the driver - this involved a large single front window replacing the original configuration that had two small windows instead. In the late 1990s the drivers side front window was enlarged to prevent eye and back problems for drivers focusing on the mainline ahead. The pillar separating the driver's window and the central window created a potentially dangerous blind spot and caused a distraction for drivers as their vision had to adjust to focus, or alternatively adopt unnatural sitting positions. Drivers started to notice left-eye fatigue and back issues after long shifts or extended periods driving the locomotives. The pillar was moved 100mm to the left with the top and bottom sills was raised and lowered at the same time to give drivers a better view of the track immediately in front and below. Fewer issues have been reported since.

Livery

The DF class were initially delivered in the International Orange "fruit salad" (red, grey and yellow) livery, or the variation "flying tomato" (same though without the grey), which they wore through until the 1990s. As part of the rebuilding to DFT they were repainted into the Cato Blue livery (Fruit Salad with blue in place of red), with some later receiving the Bumble Bee (black and yellow) and Tolls' Corn Cob (green and yellow) schemes. Units are now being repainted into KiwiRail's yellow, red and grey scheme, with those on lease to Auckland Transport painted in the MAXX Blue (deep blue and yellow) livery. DF 6133 (now DFB 7307) was the only unit to receive a non-Fruit Salad livery as a DF, wearing a Tasman Forestry scheme in the early 1990s. DFs 6006, 6012, 6029 and 6058 were repainted in the Flying Tomato livery.

Ownership

In December 1996, Tranz Rail sold the DFT class to the General American Transportation Corporation (GATX, an American locomotive and rolling stock leasing company) for $131.5 million. It then leased the locomotives back for a period of 12 years. The lease ended on 19 December 2008 with ownership of the locomotives going to Tranz Rail's successor, KiwiRail, which paid a further $36.6m to buy the locomotives back.[2]

Sub-classes

In the early 2000s a number of DFTs were fitted with the Maxitrax wheelslip control and received an internal sub-classification of DFM. This was used in the Amicus computer system only, and the classification was initially not applied to the locomotives themselves which remained identified as DFT. Although Maxitrax has since been removed from these locomotives the units some of the units that were classed as DFM have had the designation applied to them when repainted into the KiwiRail livery.

In 2006 Toll Rail began installing the Brightstar engine management system into a number of DFT class locomotives, with these locomotives then officially reclassified as DFB. In all 12 locomotives have received Brightstar, with these locomotives currently undergoing a 'DFB overhaul' programme.

Withdrawals

As of January 2016, seven DF units has been withdrawn from service. DFT 7117 was withdrawn in 2013 following an accident north of Kaikoura in 2011. It is stored at Hutt Workshops and has been used as a source of spare parts for the other locomotives.[3] It was believed that the other 17 remaining DFTs would be withdrawn after the second batch of DLs arrive, owing to the decision to refurbish only the 12 DFB locomotives. However, despite the second 20 DLs now being in service only DFTs 7023,[4] 7049,[5] 7064, 7077, 7282, and 7322[4] have been withdrawn.

Accidents

A number of DF class locomotives have been involved in derailments and level crossing accidents that have required repair. The most significant incident involving a DF unit was a head-on collision between DFT 7254 and DC 4202 and DX 5448 at Waipahi in Otago in 1999, in which the driver of the DFT was killed and the locomotive suffered considerable frontal damage. After a lengthy period in storage it was repaired and returned to service renumbered as DFB 7348.

Class register

Key: In service Out of service Preserved Overhaul/Repair Scrapped
TMS No. (DFT) TMS No. (DF) Original No. Introduced Withdrawn Current Livery[n 2] Status Allocated to Notes
DFT 7008 DF 6260 February 1981 KiwiRail Phase 1 In service North Island First DFT rebuild. Damaged after hitting a truck near Temuka, March 2008. Repaired & received KiwiRail livery.[7]
DFB 7010 DF 6300 February 1981 KiwiRail In service North Island Former Auckland Transport service, released back into freight service.
DFT 7023 DF 6248 February 1981 February 2015 Toll Rail ("Corn Cob") Withdrawn[4] Stored at Hutt Workshops.
DFT 7036 DF 6317 February 1981 KiwiRail In service South Island
DFT 7049 DF 6219 February 1981 June 2014 Tranz Rail Black ("Bumble Bee") Withdrawn Stored at Hutt Workshops.
DFT 7051 DF 6231 February 1981 KiwiRail In service North Island
DFT 7064 DF 6254 February 1981 February 2015 Tranz Rail Blue Withdrawn Involved in a derailment along with DC 4006 descending the Westmere Bank north of Wanganui in September 2000[8] Stored at Hutt Workshops.
DFT 7077 DF 6225 February 1981 September 2014 KiwiRail Withdrawn Stored at Hutt Workshops.
DFT 7092 DF 6283 February 1981 KiwiRail In service North Island
DFT 7104 DF 6277 February 1981 MAXX Blue In service
DFT 7117 DF 6156 DF 1665 September 1979 July 2011 Tranz Rail Blue Withdrawn Withdrawn in July 2011 after suffering heavy damage when derailed after running into a landslide near Kaikoura on 21 June 2011[9] Stored at Hutt Workshops.[3]
DFT 7132 DF 6191 DF 1669 October 1979 KiwiRail Under repair South Island Under repair at Hutt Workshops.
DFT 7145 DF 6012 DF 1652 October 1979 KiwiRail In service North Island
DFB 7158 DF 6202 DF 1670 September 1979 KiwiRail In service North Island Collided with cement mixer truck on level crossing at Rolleston, August 1993.[10]
DFB 7160 DF 6087 DF 1659 November 1979 KiwiRail In service North Island
DFB 7173 DF 6029 DF 1653 September 1979 KiwiRail In service North Island
DFB 7186 DF 6070 DF 1658 September 1979 KiwiRail In service North Island
DFT 7199 DF 6110 DF 1662 October 1979 KiwiRail In service South Island
DFB 7200 DF 6185 DF 1668 September 1979 KiwiRail In service North Island
DFB 7213 DF 6104 DF 1661 September 1979 KiwiRail In service North Island
DFT 7226 DF 6035 DF 1654 November 1979 KiwiRail In service North Island
DFB 7239 DF 6006 DF 1651 October 1979 KiwiRail In service South Island
DFB 7241 DF 6093 DF 1660 October 1979 KiwiRail In service South Island
DFB 7267 DF 6179 DF 1667 October 1979 KiwiRail In service North Island
DFT 7282 DF 6041 DF 1655 August 1979 February 2015 Tranz Rail Black ("Bumble Bee") Withdrawn Stored at Hutt Workshops.
DFT 7295 DF 6127 DF 1663 October 1979 KiwiRail In service
DFB 7307 DF 6133 DF 1664 October 1979 KiwiRail In service North Island Received Tasman Forestry livery in November 1991 before DFT rebuild.
DFT 7322 DF 6162 DF 1666 September 1979 March 2014 Tranz Rail Blue Withdrawn Stored at Hutt Workshops.
DFT 7335 DF 6064 DF 1657 July 1979 Tranz Rail Blue In service North Island
DFB 7348 DF 6058 DF 1656 August 1979 MAXX Blue Under overhaul North Island Formerly DFT 7254. Renumbered when returned to service after involvement in a fatal collision at Waipahi in 1999[11]

Under overhaul at Hutt Workshops.

  1. ↑ Ten locomotives never received road numbers, as they began service after the introduction of TMS in 1980.
  2. ↑ Livery is from latest information posted on New Zealand Railtrack.[6]

See also

Footnotes

  1. ↑ Norman, Emily (2 July 2015). "Faster locos mean timely rides - council". Wairarapa Times-Age. Retrieved 7 August 2015.
  2. ↑ NZPA (20 August 2007). "Rolling stock decision looms for Toll NZ". The Dominion Post. Retrieved 29 December 2011.
  3. 1 2 "Railfan" 19 (2). Triple M Publications. March 2013. ISSN 1173-2229.
  4. 1 2 3 "Railfan" 21 (2). Triple M Publications. March 2015. ISSN 1173-2229.
  5. ↑ "Railfan" 20 (4). Triple M Publications. September 2014. ISSN 1173-2229.
  6. ↑ "New Zealand RailTrack". Retrieved 2010-10-03.
  7. ↑ "Rail Reports". TAIC. Retrieved 1 December 2011.
  8. ↑ "Rail Reports". TAIC. Retrieved 1 December 2011.
  9. ↑ "Freight train slips off track". stuff.co.nz. Retrieved 25 June 2011.
  10. ↑ "Passenger express train Southerner DF6202, collision with motor vehicle, Rolleston Canterbury, 25 August 1993". Transport Accident Investigation Commission. Retrieved 31 October 2015.
  11. ↑ "Rail Reports". TAIC. Retrieved 1 December 2011.

References

This article is issued from Wikipedia - version of the Thursday, May 05, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.