New South Wales Z25 class locomotive

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New South Wales Z25 class
NSWGR Class Z25 Locomotive.jpg
Type and origin
Power type Steam
Builder Beyer, Peacock & Company
Serial number2073–2092, 2308–2337, 2547–2565
Build date1881–1885
Total produced70
Specifications
Configuration:
   Whyte 2-6-0
Gauge 1,435 mm (4 ft 8+12 in) standard gauge
Driver dia.4 ft 0 in (1,219 mm)
Adhesive weight 77,000 lb (34,927 kg)
Loco weight95,000 lb (43,091 kg)
Fuel type Coal
Firebox:
  Grate area21 sq ft (2.0 m2)
Boiler pressure140 psi (0.965 MPa)
Heating surface1,145 sq ft (106.4 m2)
Cylinders 2 outside
Cylinder size 18.5 in × 26 in
(470 mm × 660 mm)
Performance figures
Tractive effort 22,060 lbf (98.1 kN)
Factor of adh. 3.49
Career
Operators New South Wales Government Railways
Class B205, Z25 from 1924
Numbers2As built: 05-254, 314-333
From 1924: 2501-2570
Preserved2510, 2535
Disposition2 preserved, 68 scrapped

The New South Wales Z25 class was a class of 2-6-0 steam locomotives operated by the New South Wales Government Railways of Australia.

Contents

Design

In the late 1870s, only 11 of the 82 goods locomotives in service on the Southern and Western lines of the New South Wales Government Railways had a leading truck. The balance had a wheel arrangement of 0-6-0. To provide a more suitable locomotive for use over the 8 chain (161 m) radius curves of the Blue Mountains line, it was decided to incorporate a Bissell pony truck on an improved version of the A93 class, previously known as B class. [1]

Beyer, Peacock & Company prepared a design which was considered to be in advance of British contemporary practice. The first twenty 205 class entered service in 1882. [1]

In service

The new engines were found to be more sluggish than the 93 class when getting away with a load, but pulled decidedly better when running tender first. Following tests on the Blue Mountains, Commissioner Goodchap recommended the installation of 50 ft. (15.25 m) turntables at Sydney, Bathurst and Goulburn which were required to turn the new locomotives. Four were allocated to the then isolated Northern network. [1]

At that time, there were thirty 93 class locomotives on order. As Locomotive Engineer W. Scott considered the new 205 class better suited to his requirements, the order was amended to thirty 205 class locomotives, but with some minor improvements. These entered service in 1883/84, eight being allocated to Northern network. [1]

Both batches were found to be prone to slipping and an increase of driving axle load was deemed to be necessary.

A further 20 arrived in 1885, five of which going to the Northern system. This last batch had cabs with steel cutaway sides, an improvement on the open cabs of the earlier batches. [1]

In the late 1880s, the class were based at Sydney, Goulburn, Penrith, Bathurst, Newcastle, Murrurundi and Armidale. [1]

From February 1901, all of the class were fitted with larger Belpaire boilers which increased their weight and also increased the heating surface, matters identified as deficient in William Thow' report of 1889. [2] At the same time, wooden cabs replaced the open cabs of the earlier batches. [1]

With the arrival of the T524 class locomotives in 1896, main line work began to be assigned to these newer classes and the 205 class were relegated to lighter branch lines. [3] In 1923, 2531 and 2534 were fitted with superheaters after accidents. [4] As part of the 1924 reclassification scheme, all 70 were reclassified as the Z25 class and renumbered 2501 to 2570. [1]

During the years of the Great Depression, many of these locomotives fell into derelict condition after becoming due for overhaul. Some were used during the load testing of the Sydney Harbour Bridge in 1932. [3]

Two identical locomotives were built for the Midland & South Western Junction Railway, England in 1895 and 1897. [5]

Preservation

Two have been preserved:

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References

  1. 1 2 3 4 5 6 7 8 Grunbach, Alex (1989). A Compendium of New South Wales Steam Locomotives. Sydney: Australian Railway Historical Society. pp. 65–69. ISBN   0 909650 27 6.
  2. Grant, Darryl (June 2005). "Two Colonies, Three Gauges - A Survey of the Locomotives of William Thow". Australian Railway History : 222–223.
  3. 1 2 Oberg, Leon (1984). Locomotives of Australia 1850's - 1980's. Frenchs Forest: Reed Books. p. 42. ISBN   0 730100 05 7.
  4. Early Locomotives of the New South Wales Railways Australian Railway Historical Society Bulletin issue 190 August 1953 pages 90-92
  5. Late Boost to the Fleet: The story behind a UK railway copy of the NSWGR's (B) 205 (Z25 Class) Australian Railway History issue 875 September 2010 pages 299/300
  6. Locomotive, Steam 2510 Office of Environment & Heritage
  7. Anatomy of a Restoration: 2510 Part II Roundhouse January 1984 page 20
  8. Anatomy of a Restoration: 2510 Part III Roundhouse April 1984 page 18

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