TasRail DQ class

DQ class
DQ 2002 outside the Port of Burnie
Type and origin Power type Diesel-electric Builder Clyde Engineering, Eagle Farm Model Electro-Motive Diesel G22C Build date 1964 - 1969 Rebuilder Hutt Workshops Rebuild date 1996 - 1999 Number rebuilt 12
Specifications Configuration: ​  • UIC Co-Co Gauge 1,067 mm (3 ft 6 in) Wheelbase 13.55 m (44 ft 5 in) between bogies 2.58 m (8 ft 6 in) between axles in each bogie Length 15.04 m (49 ft 4 in) Loco weight 91.4 tonnes (90.0 long tons; 100.8 short tons) Fuel type Diesel Fuel capacity 5,200 litres (1,100 imp gal; 1,400 US gal) Prime mover Electro-Motive Diesel 567C[1] Engine type V12 2 stroke diesel Generator Electro-Motive Diesel D25 or D32T Traction motors Electro-Motive Diesel D29 Cylinders 12 Loco brake Hand brakes/Westinghouse 26L air brake/Dynamic Train brakes Westinghouse 26L air brake
Performance figures Maximum speed 80 km/h (50 mph) Power output 1,120 kW (1,500 hp) Tractive effort 1,230 kW (1,650 hp)
Career Operators AN Tasrail Pacific National TasRail Number in class 12 Numbers 2001 - 2012 Delivered September 1998 - October 1999 First run September 1998 - October 1999 Withdrawn 2015 - present Current owner TasRail Disposition 8 in service 3 withdrawn 1 undergoing conversion to driving trailer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 due to a locomotive shortage due to 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,^[2] the rest of the locomotives were repainted into the Wisconsin Central Maroon livery.^[3][4] 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.^[5][4] After arrival, the locomotives were towed to Tasrails East Tamar Workshops for adjustments and testing, before entering service later that month.^[6] 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.^[7] The locomotives have also had vibration issues in Tasmania, and well as in New Zealand since being rebuilt.^[6] 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.^[3] 2006 carries a level crossing safety advertisement,^[8] while 2012 carries logos commemorating the 75th anniversary of the Rosebery Mine.^[9]

Withdrawals

DQ 2011 after a derailment on the Melba Line in April 2009.

Due to the introduction of the TR class, DQs 2003, 2004, 2005 and 2007 were withdrawn from service, and would require heavy overhauls and other work before being available for use.^[7] By late 2015, the serviceable DQs are predominately used on Melba Line services, as well as yard shunters in Burnie and Devonport. They do make occasional trips east/south to cover loco failures.^[7] Since the commencing of the withdrawals, DQ 2008 has been reinstated to due to a locomotive shortage. In 2017, it was confirmed that DQ 2007 would be converted into a driving trailer to a driving trailer for the Railton to Devonport cement trains, to replace DV 1.

Class register

See also

• New Zealand DQ and QR class locomotives
• Queensland Railways 1460 class
• Queensland Railways 1502 class

References