New South Wales 41 class locomotive

New South Wales 41 class
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 Configuration: ​  • UIC Bo'Bo' Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge 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) Loco 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 cap. 45 imp gal (200 L; 54 US gal) per engine Coolant cap. 40 imp gal (180 L; 48 US gal) per engine Sandbox cap. 11.5 cu ft (0.33 m3) Prime mover Paxman 12-RPHL, 2 of RPM range 680-1300 Engine type Four-stroke, V12, diesel Aspiration Normally aspirated Generator British Thomson-Houston RTB 10844 Traction motors British Thomson-Houston 157AZ, 4 of Cylinders 12 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Career Operators NSW Department of Railways Number in class 10 Numbers 4101-4110 First run 30 October 1953 Withdrawn 30 June 1975 Preserved 4102 Disposition 1 preserved, 9 scrapped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 Department of Railways in 1953 and 1954.

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 the radiators were relocated further to the ends of all ten of the locomotives and air ducting was modified. In addition, 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 1957 following two electrical fires, the second in April 1961, the third in September 1969, 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]

In December 1976, 4102 was placed by the Public Transport Commission in the custody of the NSW Rail 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 a one-engine shunter until the batteries finally wore out in 1987.

By July 1991, it had moved to CountryLink's XPT Service 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. In May 2023 it was moved to the Heritage Hub at Chullora Workshops.

Wikimedia Commons has media related to New South Wales 41 class locomotive.

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