New South Wales D58 class locomotive

New South Wales D58 class locomotive
New South Wales D58 class
5808 with a westbound goods train passing below the Lithgow Zig Zag
Power type Steam
Builder NSWGR Eveleigh Workshops (11)
NSWGR Cardiff Workshops (2)
Total produced 13
Configuration 4-8-2
UIC classification 2'D1'h
Gauge 4 ft 8 1⁄2 in (1,435 mm)
Driver diameter 5 ft 0 in (1.524 m)
Weight on drivers 212,000 lb (96 t)
Locomotive weight 311,000 lb (141 t)
Boiler pressure 200 psi (1.38 MPa)
Firegrate area 65 sq ft (6.04 m)
Heating surface:
Total		 3,390 sq ft (314.94 m)
Superheater area 775 sq ft (72.00 m)
Cylinders Three
Cylinder size 21.5 × 28 in (546 × 711 mm)
Valve gear Rack and pinion
Tractive effort 55,008 lbf (244.7 kN)
Factor of
adhesion		 3.84
Career New South Wales Government Railways
Class D58
Disposition All scrapped

The D58 class was a class of steam locomotives operated by the New South Wales Government Railways in Australia. They were built with the 4-8-2 wheel arrangement.

Contents

Construction

In 1943, approval was given for the N.S.W.G.R. Workshops to build 25 locomotives and tenders to a design modified from the D57-class. The main alterations were the use of a rack and pinion valve gear[1] in lieu of the Gresley 2:1 conjugated vale gear for the middle cylinder and the use of smaller cylinders to enable the locomotives to run to Newcastle, a route which had a tighter loading gauge. They also used a Woodard divided drive of twin coupling rods between the second and third driving wheels. A valance was fitted over the valve gear on the front platform.

Eveleigh Workshops built 11 locomotives and Cardiff Workshops built two. 5801 was placed in traffic in March, 1950. Following the building of 13 locomotives, construction was suspended owing to lack of funds, dieselisation and also, to a degree, dissatisfaction with their performance in traffic. Work was never resumed on the remainder of the order.

Arhs 58 class.jpg

Operations

5801 brings a South Coast goods train into Sutherland station

Whilst the derived rack and pinion valve gear appeared far superior in theory, in practice it required more maintenance and lubrication. The smaller diameter cylinders demanded a later cut-off and used more steam, thus making the locomotives uneconomical in the use of coal and water when compared with the 57-class. Despite the design being made to enable use on the Main Northern line from Sydney to Broadmeadow, very few journeys were ever made.

After a very short service life, the entire class had been withdrawn by July, 1957 and were all cut up by March, 1964. Some parts were recovered and used on 57-class locomotives. There are no surviving examples, however the tender of 5808 lies near Canberra Station. Many 57 and 58 class tenders were used as water tankers around NSW. One is at the DSR&M. Some small parts are with the NSWRHC.[2]

References

  1. ^ Slee, David E. (January 2000). "D57 and D58 Classes—Design Differences and Power Comparisons". Australian Railway Historical Society Bulletin: pp.3–19. 
  2. ^ Wright, H. (July 1964). "The Last of the 58-Class 'Mountain' Locomotives". Australian Railway Historical Society Bulletin: pp.130–132. 

http://www.australiansteam.com/58%20Class.htm

Further reading

v · d · eSydney and New South Wales Rail Rollingstock
NSWGR steam locomotive
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Diesel locomotive
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