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Specifications
Specifications
Configuration:;
• UIC	Co-Co
Gauge	3 ft 6 in (1,067 mm)
Wheel diameter	3 ft 4 in (1.016 m)
Wheelbase	38 ft 5+1⁄2 in (11.722 m) total, 12 ft 6 in (3.810 m) bogie
Length	49 ft 4 in (15.037 m) over headstocks
Axle load	15 long tons (15 t; 17 short tons)
Loco weight	90 long tons (91 t; 100 short tons)
Fuel type	Diesel
Fuel capacity	1,100 imp gal (5,000 L)
Prime mover	EMD 12-645E (2001–2004); EMD 12-645C (2005–2012)
Engine type	V12 2 stroke diesel
Generator	EMD D32T (2001–2004); EMD D25 (2005–2012)
Traction motors	EMD D29
Cylinders	12
Cylinder size	9+1⁄16 in × 10 in (230 mm × 254 mm)
MU working	74 V, eight-notch
Loco brake	Westinghouse 26L air brake
Train brakes	Westinghouse 26L air brake

Type and origin
Type and origin
Power type	Diesel-electric
Builder	Clyde Engineering, Eagle Farm
Model	EMD G22C
Build date	1964–1969
Rebuilder	Hutt Workshops
Rebuild date	1996–1999
Number rebuilt	12

DQ class
DQ class
	DQ 2002 outside the Port of Burnie
Power type
Type and origin
Power type	Diesel-electric
Builder	Clyde Engineering, Eagle Farm
Model	EMD G22C
Build date	1964–1969
Rebuilder	Hutt Workshops
Rebuild date	1996–1999
Number rebuilt	12
Configuration:;
Specifications
Configuration:;
• UIC	Co-Co
Gauge	3 ft 6 in (1,067 mm)
Wheel diameter	3 ft 4 in (1.016 m)
Wheelbase	38 ft 5+1⁄2 in (11.722 m) total, 12 ft 6 in (3.810 m) bogie
Length	49 ft 4 in (15.037 m) over headstocks
Axle load	15 long tons (15 t; 17 short tons)
Loco weight	90 long tons (91 t; 100 short tons)
Fuel type	Diesel
Fuel capacity	1,100 imp gal (5,000 L)
Prime mover	EMD 12-645E (2001–2004); EMD 12-645C (2005–2012)
Engine type	V12 2 stroke diesel
Generator	EMD D32T (2001–2004); EMD D25 (2005–2012)
Traction motors	EMD D29
Cylinders	12
Cylinder size	9+1⁄16 in × 10 in (230 mm × 254 mm)
MU working	74 V, eight-notch
Loco brake	Westinghouse 26L air brake
Train brakes	Westinghouse 26L air brake
Maximum speed
Performance figures
Maximum speed	80 km/h (50 mph)
Power output	Gross: 1,650 hp (1,230 kW); Net: 1,500 hp (1,120 kW)
Operators
Career
Operators	AN Tasrail; Pacific National; TasRail
Number in class	12
Numbers	2001–2012
Delivered	Sep 1998 to Apr 1999
Current owner	TasRail
Disposition	8 in service; 3 withdrawn; 1 converted to driving trailer

The DQ class were a class of diesel locomotives in New Zealand and Tasmania. Originally built by Clyde Engineering in the 1960s as Queensland Rails 1460 and 1502 class locomotives. They were purchased by Tranz Rail in 1995 to be rebuilt, as a cheaper alternative to buying new locomotives. Tranz Rail rebuilt 16 locos into the DQ class. Tranz Rail then sold the 12 DQs to AN Tasrail. Only eight out of the twelve DQs are still in service today.

Introduction and service

DQ 2006 leads the two D class locomotives with a freight train in at Glenorchy

Following the rebuilding of the DQ and QR class locomotives at Tranz Rails Hutt Workshops, Tranz Rail sold twelve DQs for the planned replacement of Tasrails English Electric locomotive fleet. DQs 2001 and 2002 were repainted into the ATN Red livery. Due to the Australian Transport Network not being impressed with the looks and the cost of the livery,^[1] the rest of the locomotives were repainted into the Wisconsin Central Maroon livery.^[2]^[3] With the sales of the twelve locomotives, they were renumbered in the 20XX series from the 60XX series (1502 class rebuilds) and 63XX (1460 class rebuilds), as they were in New Zealand.

On 2 September 1998, DQs 2001 and 2002 arrived in Bell Bay.^[3]^[4] After arrival, the locomotives were towed to Tasrails East Tamar Workshops for adjustments and testing, before entering service later that month.^[5] A second batch of three locomotives arrived on 16 December 1998, with the third batch arriving on 3 March 1999. The last batched arrived on 5 October 1999. The locomotives have had a high number of main generator failures, since their arrivals. Reductions in rated haulage capacity in recent years have reduced the number of in service failures and train operating problems.^[6] The locomotives have also had vibration issues in Tasmania, and well as in New Zealand since being rebuilt.^[5] The locomotives were later sold to AN Tasrail.

With Pacific National selling the Tasmanian railway system to TasRail, six locomotives have been repainted into the new grey and yellow livery. DQ 2001, which had just been reassembled, became the first loco to carry the new livery in August 2010. Two DQs are carrying special advertising panels, in-place of TasRails logo.^[2] 2006 carries a level crossing safety advertisement,^[7] while 2012 carries logos commemorating the 75th anniversary of the Rosebery Mine.^[8]

Withdrawals

Due to the introduction of the TR class, DQs 2003, 2004, 2005, 2007 and 2008 were withdrawn from service, and would require heavy overhauls and other work before being available for use.^[6] with the rest to follow. By late 2015, with the failure of the TR class to be able to operate on the Melba Line, the serviceable DQs were forced to continue on Melba Line services. They also remained in use as yard shunters in Burnie and Devonport. The poorer than expected availability on the TR's has seen DQ's make occasional trips east/south.^[6] DQ 2008 has been reinstated to cover locomotive shortages.^[6] In 2017, it was confirmed that DQ 2007 would be converted into a driving trailer for the Railton to Devonport cement trains to replace DV 1.^[6] In mid-2019, 2007 was converted and re-numbered DV2, replacing DV1 (Y7).^[6]

References

^ "Railfan". Vol. 4, no. 4. Triple M Publications. September 1998. ISSN 1173-2229.
^ ^a ^b "Locomotive Colour Schemes". RailTasmania.com. Retrieved 2 April 2017.
^ ^a ^b "Railfan". Vol. 5, no. 1. Triple M Publications. December 1998. ISSN 1173-2229.
^ "New Zealand Railway Observer". Vol. 55, no. 3. New Zealand Railway and Locomotive Society. Spring 1998. ISSN 0028-8624.
^ ^a ^b "Railfan". Vol. 5, no. 3. Triple M Publications. June 1999. ISSN 1173-2229.
^ ^a ^b ^c ^d ^e ^f "DQ Class". RailTasmania.com. Retrieved 19 April 2017.
^ "DQ 2006". RailTasmania.com. Retrieved 19 April 2017.
^ "DQ 2012". RailTasmania.com. Retrieved 19 April 2017.