New South Wales 41 class locomotive

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New South Wales 41 class
250px
4105 heading for Campbelltown in March 1961
Type and origin
Power type Diesel-electric
Builder British Thomson-Houston, Rugby, United Kingdom
Build date 1953/54
Total produced 10
Specifications
UIC classification Bo-Bo
Gauge 1,435 mm (4 ft 8 12 in)
Wheel diameter 42 in (1,067 mm)
Length Over headstocks:
43 ft 0 in (13.11 m),
Over coupler pulling faces:
47 ft 3 in (14.40 m)
Width 9 ft 4 in (2.84 m)
Height 14 ft 0 in (4.27 m)
Axle load 20 long tons 10 cwt (45,900 lb or 20.8 t)
Locomotive weight 82 long tons 0 cwt (183,700 lb or 83.3 t)
Fuel type Diesel
Fuel capacity 500 imp gal (2,300 L; 600 US gal)
Lubricant capacity 45 imp gal (200 L; 54 US gal) per engine
Coolant capacity 40 imp gal (180 L; 48 US gal) per engine
Sandbox capacity 11.5 cu ft (0.33 m3)
Prime mover Paxman 12-RPHL, 2 of
Engine RPM range 680-1300
Engine type Four-stroke diesel
Aspiration Normally aspirated
Generator British Thomson-Houston RTB 10844
Traction motors British Thomson-Houston 157AZ, 4 of
Cylinders V12
Cylinder size 7 in × 7.75 in (178 mm × 197 mm)
Performance figures
Maximum speed 57 mph (92 km/h)
Power output Gross: 400 hp (298 kW) per engine,
For traction: 360 hp (268 kW) per engine
Tractive effort Continuous: 22,800 lbf (101.42 kN) at 11 mph (18 km/h)
Career
Operator(s) New South Wales Government Railways
Number in class 10
Number(s) 4101-4110
First run 1 December 1953
Withdrawn 30 June 1975
Preserved 4102
Disposition 1 preserved, 9 scrapped

The 41 class were a class of diesel locomotives built by British Thomson-Houston in the United Kingdom for the New South Wales Government Railways in 1953/54.

History[edit]

4108 brings a coal train from Narellan into Campbelltown
4102 in storage at Broadmeadow Locomotive Depot in December 2012

In 1950 the New South Wales Government Railways ordered 10 diesel locomotives from Australian General Electric.[1] The construction was sublet to British Thomson-Houston of Rugby in the United Kingdom with the body built by Metro Cammell, Birmingham.[2][3] The first entered service in December 1953 and the last in February 1955.[4] All were delivered painted in verdant green, in the 1960s all were repainted Indian red.

From their earliest days the locomotives suffered failures including overheating and fires. To try and overcome this two had their mufflers relocated. The modification was considered a success, but not rolled out across the rest of the class. The locomotives were equipped to operate in multiple however the cooling system layout saw radiator heat passing from the leading locomotive to the trailing one, resulting in the equipment being removed.[1]

By the early 1960s with the twin Paxman 12-RPHL engines coming to the end of their useful life, the Mechanical Branch began looking at repowering options. With the cost of repowering and overhauling the Class 41s being two-thirds that of a new Class 48 and repair costs per mile over nine times greater, it was decided not to proceed with this.[1]

One was set aside in December 1967, while overhauls ceased for the rest of the class in 1972 with each locomotive withdrawn as it suffered a major failure, the final locomotive being withdrawn in June 1975.[1] The class were mainly confined to metropolitan Sydney operating local trip workings and shunting at Enfield yard.[1]

Preservation[edit]

In December 1976 4102 was placed by the Public Transport Commission in the custody of the New South Wales Rail Transport Museum and is now a designated NSW heritage item.[5][6]

After it arrived at Thirlmere in January 1977, the seized engine that led to its demise was temporarily repaired by members of the Illawarra Group. In 1982 an engine failed whilst returning from a trip to Picton and as a consequence 4102 was then used as an one-engine shunter until the batteries finally wore out in 1987.

By July 1991 it had moved to CountryLink's XPT Maintenance Centre in Sydenham (where the Paxman engined XPTs are maintained), where a spare engine was installed.[7] It returned to Thirlmere in November 1992, but was not restored to service.[8] In April 2009 4102 was moved for further storage at the Broadmeadow Locomotive Depot.

One of the Paxman diesel engines of 4102 as stored at Broadmeadow Locomotive Depot

Status table[edit]

Number Serial No Entered Service Withdrawn Kilometres Travelled
4101 1000 1 Dec 1953 6 Jun 1973 463,514
4102 1002 30 Oct 1953 30 Jun 1975 492,650
4103 1003 18 Jan 1954 2 Apr 1974 462,871
4104 1004 13 Jan 1954 12 Oct 1973 440,810
4105 1005 8 Feb 1954 ? ?
4106 1006 21 Jan 1954 4 Aug 1972 406,288
4107 1007 25 Jan 1954 11 Aug 1973 446,167
4108 1008 22 Feb 1954 20 Dec 1967 402,026
4109 1009 11 Mar 1954 9 Feb 1972 426,074
4110 1010 10 Feb 1955 20 May 1974 476,489

References[edit]

  1. ^ a b c d e Leaver, Allan (January 1984). "41 Class Album". Roundhouse (NSW Rail Transport Museum). 
  2. ^ "The 41-Class Diesel-Electric Locomotive". Australian Railway Historical Society Bulletin: pp 1–3. January 1954. 
  3. ^ 41 Class Railpage
  4. ^ Class 41 Vicsig
  5. ^ RailCorp S170 Heritage & Conservation Register RailCorp
  6. ^ Locomotive, Diesel 4102 NSW Government Environment & Heritage
  7. ^ "4102" Railway Digest August 1991 page 282
  8. ^ "Locomotives and Traffic 4102" Railway Digest March 1993 page 108

Further reading[edit]

  • New South Wales Rail System Locomotives. Sydney: Archives Section, State Rail Authority of New South Wales. 1984.