- New South Wales 41 class locomotive
New South Wales 41 class 4105 heads a Via Crucis special towards Campbelltown, Good Friday 1961 Power type Diesel-electric Builder British Thomson-Houston, UK Total produced 10 AAR wheel arr. B-B UIC classification Bo′Bo′ Gauge 4 ft 8 1⁄2 in (1,435 mm) 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 tons 10 cwt (45,900 lb or 20.8 t) Locomotive weight 82 tons 0 cwt (183,700 lb or 83.3 t) Fuel type Diesel fuel 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 off Engine RPM range 680–1300 Engine type Four-stroke diesel Aspiration Normally aspirated Generator BTH RTB 10844 Traction motors BTH 157AZ, 4 off Cylinders V12 Cylinder size 7 × 7.75 in (178 × 197 mm) Top 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at 11 mph (18 km/h) Career New South Wales Government Railways Number 4101–4110 First run 30 October 1953 Retired 1975 Withdrawn June 1975 Preserved 4102 Disposition 1 preserved, remainder scrapped
The 41 class was a class of diesel locomotive ordered and operated by the New South Wales Government Railways in Australia between 1953 and 1975. The class was the second mainline diesel locomotive type used by the government railways as part of the NSWGR's introduction of new diesel locomotives. However, the class proved to be unreliable and only served the railways for 22 years, with the last example withdrawn in 1975.
An order was placed for ten 1,000 horsepower (750 kW) diesel locomotives with Australian General Electric Pty. Ltd. in 1950 by the New South Wales Government Railways. The contract was then sent to their sub-contractors, British Thomson-Houston, in the UK. Locomotive 4101 was delivered later than the second example, 4102 (4102 was delivered 13 October 1953), and the last member of the class, 4110, was delivered in February 1955.
The Paxman 12-RPHL engine was very unreliable due to low cooling water capacity-similar problems existed on the British Rail (BR) locomotive classes 15 and 16 . The excitation system was not allowing the two motors to share the same load-also the cooling system layout did not allow multiple locomotives to work due to the radiator heat passing from the leading 41 class loco to the trailing locos.
Modifications were carried out in 1955–1956 to make the radiators extend forward, blank off the side off exit panels and duct the hot air out through the headlight, and mufflers were modified on 4102 and 4104 in 1958. This included relocating the mufflers to over the normal roofline-this was successful, but locomotives 4101, 4103, and 4105-4110 was not modified.
4110 was the last locomotive to wear the green colour scheme on a diesel locomotive, before been repainted Tuscan Red in August 1970. The railways administration had run out of patience with the class by around the 1960s and some of the locomotives were put aside. 4102 was the last locomotive in service, been withdrawn in June 1975 after seizing a piston in the 'A' engine, and had travelled 492,650 km-the most used out of the class.
After it arrived at the New South Wales Rail Transport Museum in 1977, the engine was temporarily repaired by members of the Illawarra Group. It failed again in 1982 following another failure in the 'A' engine whilst returning from a trip in Picton with a loop-line train and 4102 was then used as an one-engine shunter until 1987, when the batteries finally wore out. During 1996, it was stored at the XPT Meeks Road Maintenance Centre in Sydenham, where the spare engine was put in. It has since returned to the NSW RTM, but before the locomotive can be used again, it needs to have its engines started and commissioned first.
- Principal contractor: British Thomson-Houston Co. Ltd., Rugby, England
- Bodywork by: Metropolitan Cammell Carriage & Wagon Co. Ltd., Birmingham, England
- Cost: 62,220 13 3 pounds each (622,201 33 pounds total cost)
- New South Wales Rail System Locomotives. Sydney: Archives Section, State Rail Authority of New South Wales. 1984.
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