New South Wales 620/720 class railcar
|620/720 Class Railcars|
625/725 at Newcastle station
Interior of a 620/720 carriage
|Manufacturer||New South Wales Government Railways|
|Built at||Chullora Railway Workshops|
|Scrapped||Last revenue service in 2007|
|Number built||18 two-car units|
|Number in service||0|
|Formation||1 power car, 1 driving trailer car|
|Fleet numbers||621/721 - 638/738|
|Car body construction||Aluminium body on steel underframe|
|Car length||18.67 m (61 ft 3 in)|
|Width||2.97 m (9 ft 9 in)|
|Maximum speed||115 km/h (71 mph)|
|Prime mover(s)||Rolls-Royce C8SFLH, 250 hp / GM Detroit Diesel 6/110, 250 bhp / Cummins NHHRTO-6-B1, 265 hp / Cummins NTA-855-R2, 300 hp / Cummins NTA-855-R4, 335 hp|
|Power output||500 hp (370 kW) |
(250 hp or 190 kW x 2);
530 hp (400 kW)
(265 hp or 198 kW x 2);
600 hp (450 kW)
(300 hp or 220 kW x 2);
670 hp (500 kW)
(335 hp or 250 kW x 2)
|Transmission||Automatic lockup torque converter|
|Power supply||24 V DC|
|Braking system(s)||S.E.M. electro-pneumatic straight air with emergency feature, handbrake|
|Track gauge||1,435 mm (4 ft 8 1⁄2 in) standard gauge|
The 620/720 class railcars were an evolution of the 600/700 railcars that had been built in 1949/50. Like their predecessors they were built with an aluminium body on a steel frame at the New South Wales Government Railways' Chullora Railway Workshops. However they were fitted with different engines, six receiving two 8-cylinder Rolls-Royce C8SFLH with Rolls-Royce DFR 11500 transmissions, 11 receiving two 6-cylinder GM Detroit Diesel 6/110 with Allison RC3 transmissions and one receiving two 6-cylinder Cummins NHHRTO-6-B1 engines with Twin Disc DFFR 10034 transmissions.
The first five sets were ordered to operate suburban services out of Newcastle and were fitted with economy class seats throughout. The next six were constructed with both first and economy class accommodation to operate longer services out of Newcastle and between Liverpool and Campbelltown until the latter section was electrified in 1968. The remaining seven were constructed to operate regional services including :
- Sydney Central to Lithgow via Goulburn and Cowra
- Grafton to Casino
- Orange to Mudgee via Lithgow
- Dubbo based services
- Casino to Murwillumbah
From the mid-1970s one was attached to the DEB set operating the Canberra Monaro Express during times of heavy demand. In late 1984, two were transferred to Wollongong from Lithgow joining three sets that had been there for many years. The balance of the fleet by this stage was all based in Newcastle.
Withdrawals and Upgrades
During the life of the class, three cars were damaged in accidents and withdrawn. NPF 624 was burnt out at Gosford in 1981, NTC 734 was damaged in a collision with a motor vehicle on the Gwabegar line in 1981 and subsequently withdrawn in 1983, while NTC 728 was damaged in a collision with a coal train at Hexham in 2002 and was not repaired. NPF 634 was matched with trailer NTC 724 and they operated as a mismatched set until they were withdrawn.
MPF 638 was fitted with Japanese Niigata DBRG2115 transmissions as a trial in 1978 and proving reasonably successful Niigata transmissions were deployed in some of the 900 Class power cars. Aging equipment plagued the Class in the 1970s and five units received 300 hp Cummins NTA-855-R2 engines and Twin Disc DFFR 10034 transmissions originally destined for upgrading the 600 Class power cars.
From the early 1980s, the remaining Rolls-Royce and GM powered units, along with Cummins powered NPF 638, were fitted with 335 hp Cummins NTA-855-R4 engines and Voith T211r transmissions. This drive train proved highly successful and was also deployed in the 900 Class power cars.
First 11 withdrawn
It was planned that all would be replaced by the 15 Endeavour railcars in 1994 but after it was decided to divert some of these to Main South line services, seven were retained, all in Newcastle. These were all overhauled by Rail Services Australia, Chullora in 1999 including a repaint into CityRail livery and fluorescent lights fitted. The seven sets remaining (621/721, 623/723, 625/725, 626/726, 628/728, 629/729 and 631/731) were based at the CityRail Endeavour Service Centre at Broadmeadow. These units, in conjunction with five Endeavour railcar sets provided services on the Hunter Valley network.
Final 7 withdrawn
A few have been preserved:
- 621/721 has been designated a heritage item and placed in the care of the Rail Motor Society, Paterson and restored to operational condition in the Indian red colour scheme
- 622/727 preserved at Tenterfield station
- 623/723 has been designated a heritage item and placed in the care of the New South Wales Rail Transport Museum, Thirlmere
- 626 by Goodwin Alco
- 726 by Lithgow State Mine Heritage Park & Railway
- 627/630 by Hills Transport, Tamworth
- 629/729 by Goodwin Alco
- 632/732 by New England Railway, Armidale
- 633/733 by the Dorrigo Steam Railway & Museum
- 638/738 by the Lachlan Valley Railway, Cowra
RailCorp has converted 631/731 to Mechanised Track Patrol Vehicle ML070 with 625/725 retained as a source of spares. Cooma Monaro Railway secured ownership of both in January 2015 and they are currently stored in the Cooma railway yard precinct.
- Cooke, David (1984). Railmotors and XPTs. Australian Railway Historical Society NSW Division. ISBN 0-909650-23-3.
- Stokes, HJW (1984). Railways of the Canberra and Monaro Districts. Canberra: Australian Railway Historical Society, ACT Division. p. 27.
- "620 Sets" Railway Digest December 1985 page 355
- "Endeavours Enter Service Only Days After Launch" Railway Digest May 1994 page 10
- "CityRail 620 Class "Great Survivor" Refurbishment Underway" Railway Digest April 1999 page 9
- "Hunter Valley farewells red rattler". News Online. Australian Broadcasting Corporation. 2007-10-29.
- NPF 621 - Diesel Power Car Department of Environment & Heritage
- NTC 721 - Diesel Power Car Department of Environment & Heritage
- "A Tale of Two Monuments" Railway Digest June 2013 page 54
- NPF 623 - Diesel Power Car Department of Environment & Heritage
- NTC 723 - Diesel Power Car Department of Environment & Heritage
- The last Sputnik leaves the depot Goodwin Alco blogspot 5 April 2011
- Newsletter No 3 Lithgow State Mine Railway and currently undergoing restoration November 2013
- "Tamworth Takes to Tourism Training Train" Railway Digest August 2000 page 43
- 629/729 Goodwin Alco
- "Eligible Preservation Groups" Railway Digest December 1998 page 39
- Dorrigo Railway Museum Exhibit List 37 Dorrigo Steam Railway & Museum 17 March 2011
- 620s are back on track Paterson Points June 2010 page 5