New South Wales 73 class locomotive

New South Wales 73 class locomotive
New South Wales 73 class
Candy coloured 7318 shunts Grafton yard in January, 1986
Power type Diesel-hydraulic
Builder Walkers Limited, Maryborough, Queensland
Build date 1970–1973
Total produced 50
UIC classification B′B′
Gauge 4 ft 8 12 in (1,435 mm)
Wheel diameter 40 in (1,016 mm)
Wheelbase 26 ft 6 in (8.08 m)
Length Over headstocks: 36 ft 0 in (10.97 m),
Over buffers: 39 ft 4 in (11.99 m)
Width 9 ft 3 in (2.82 m)
Height 13 ft 6 in (4.11 m)
Axle load 12 tons 5 cwt (27,400 lb or 12.4 t)
Locomotive weight 49 tons 0 cwt (109,800 lb or 49.8 t)
Fuel type Diesel fuel
Fuel capacity 500 imp gal (2,300 l; 600 US gal)
Lubricant capacity Engine: 42 imp gal (190 l; 50 US gal),
Transmission: 58 imp gal (260 l; 70 US gal),
Final drive: 3.25 imp gal (14.8 l; 3.90 US gal)
Coolant capacity 80 imp gal (360 l; 96 US gal)
Sandbox capacity 10 cu ft (0.28 m3)
Prime mover Caterpillar D379 series B
Engine RPM range 550–1450
Engine type Four-stroke diesel
Aspiration Turbocharged
Cylinders V8
Cylinder size 6.25 × 8 in (159 × 203 mm)
Transmission Voith L4r4U2, with Gmeinder Type GM170/EHA/469 and GM170/E/327B drives
Top speed 40 mph (64 km/h)
Power output Gross: 700 hp (522 kW),
For traction: 650 hp (485 kW)
Tractive effort Continuous: 25,000 lbf (111.21 kN) at 5.4 mph (0.00 kN)
Career New South Wales Government Railways
Number 7301–7350
First run 5 October 1970
Green 7344 shunts at Sydney Station in October, 1991. It was still in SRA hands.

The New South Wales 73 class are a diesel-hydraulic locomotive originally purchased and operated by the New South Wales Government Railways (NSWGR) of Australia, and now operated by a variety of private operators. The NSWGR were in the need of powerful diesel shunting locomotives in the 1960s. They had experimented with the 7101 and 7201. Following an order by Queensland Railways for similar units, the NSWGR placed an order with Walkers Limited for 20 B-B units fitted with a Caterpillar 485 kW diesel engine.[1] These were the first NSWGR locomotives to be built in Queensland.[2]

Contents

Delivery

The first unit was delivered in October, 1970. When the whole of the first order had arrived, all steam shunting on the North Coast line and the Sydney Metropolitan area, as well as at Goulburn had been replaced. Their presence was an immediate success and a further 50 units were ordered. The last of these arrived in March, 1973 and this brought to an end all remaining steam shunting operations throughout the state.[1]

In traffic

The New South Wales Government Railways purchased the class mainly for shunting and their prohibition from mainline use was 'officially' due to the lack of vigilance controls. However, despite its absence, the class was still seen on many suburban trip workings and when mainline operation was a necessity, there seemed to be no hesitation to use them.

One advantage a diesel-hydraulic locomotive has over a diesel-electric variety is its ability to negotiate up to 300mm of water over the tracks. The big floods of 1976 gave 7323 an opportunity to show off its swimming ability. In March that year, water covered the line near Bourke and this locomotive was used on a couple of freight trains and a ballast train from Nyngan to Bourke and return. At least two other occasions when their water resistance was put to use was Menindee in 1976 and Hexham in 1977.

Multiple unit operation was common, although the flood event at Hexham is the only known occurrence of triple-heading. A number of units were fitted with exhaust gas scrubbers for use on Eastern Suburbs Railway construction.[3]

Depot allocation

As an example of the spread of the members of the class throughout the system, the fleet was allocated as follows as at 30 August 1977:

Depot Allocation
Eveleigh 7301–7314; 7317; 7321; 7339–7345
Goulburn 7315; 7316
Cootamundra 7319
Junee 7320 (Actually working at Albury)
Lithgow 7326
Orange 7322
Dubbo 7323; 7324
Parkes 7325
Broadmeadow 7327–7338
South Grafton 7318
Werris Creek 7346 (actually working at West Tamworth); 7347
Yeerongpilly (Queensland) 7348–7350

Withdrawal

CRT Group shunter 7334 at the Altona terminal in 2007

February 1987, saw the first withdrawal, regardin unit 7330, for the class. Others quickly followed and, today, only one unit, class leader 7301, remains in the hands of Rail Corp. It was last used as a shunter at the XPT Maintenance Depot at Meeks Road, Sydenham. This unit would also occasionally transfer carriages to the wheel lathes at either Enfield or Flemington.[1]

Scrapping

The following units have been scrapped:[4]
7302, 7303, 7311, 7312, 7316, 7323, 7326, 7338, 7342, 7345.

Stored

7301 Meeks Rd XPT depot

Preserved

The following are held by recognised preservation groups:[4]

  • 7307 Oberon Tarana Heritage Railway
  • 7320 Privately owned
  • 7321 Oberon Tarana Heritage Railway
  • 7324 Privately owned
  • 7329 Dorrigo Steam Railway and Museum
  • 7335 Dorrigo Steam Railway and Museum
  • 7344 3801 Limited Leased to them by RailCorp
  • 7350 Hunter Valley Railway Trust

Sold

The following units were sold for further commercial operation, some being converted to 610 mm (2 ft) :-[4]

Sold 73 Class Locomotives
Number Sold to Current Location
7304 Mackay Sugar Limited - 610mm -
7305 Farleigh Mill - 610mm Mackay Sugar Limited - 610mm
7306 Pleystowe Mill - 610mm Mackay Sugar Limited - 610mm
7307** Oberon Tarana Heritage Railway Inc Oberon NSW
7308 Pleystowe Mill - 610mm Mackay Sugar Limited - 610mm
7309 CSR Plane Creek Mill - 610mm -
7310 CSR Limited Invicta Mill - 610mm -
7313 Pleystowe Mill - 610mm Mackay Sugar Limited - 610mm
7314 Proserpine Mill - 610mm -
7317 CSR Plane Creek Mill - 610mm -
7318 CSR Limited Invicta Mill - 610mm -
7321** Oberon Tarana Heritage Railway Inc Oberon NSW
7322 Colin Rees Transport QR National (stored)
7325 CSR Limited Invicta Mill - 610mm -
7327 Mackay Sugar Limited - 610mm -
7328 Farleigh Mill - 610mm Mackay Sugar Limited - 610mm
7330 Farleigh Mill - 610mm Mackay Sugar Limited - 610mm
7331 Farleigh Mill - 610mm Mackay Sugar Limited - 610mm
7332 Mackay Sugar Limited - 610mm -
7333 Colin Rees Transport QR National
7334 Colin Rees Transport Wimmera Container Line
7336 Sarina Mill - 610mm -
7337 Marian Mill - 610mm Mackay Sugar Limited - 610mm
7339 Proserpine Mill - 610mm -
7340 Manildra -
7341 Mackay Sugar Limited - 610mm -
7343 Marian Mill - 610mm Mackay Sugar Limited - 610mm
7346 CSR Limited Invicta Mill - 610mm -
7347 CSR Plane Creek Mill - 610mm -
7348 CSR Limited Invicta Mill - 610mm -
7349 CSR Plane Creek Mill - 610mm -

Sold into preservation in 2010**

References

  1. ^ a b c Locomotives of Australia Oberg, Leon Rosenberg Publishing Pty Ltd ISBN 9781877058547
  2. ^ Clark, Peter J. (1973). An Australian Diesel Locomotive Pocketbook. Australian Railway Historical Society NSW Division. ISBN 0-909650 02 0. 
  3. ^ Australian Model Railway Magazine: pp. 18–25. November/December. 
  4. ^ a b c Locopage Retrieved 13.10.2008
  • New South Wales Rail System Locomotives. Sydney: Archives Section, State Rail Authority of New South Wales. 1984.

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