New South Wales Z19 class locomotive

New South Wales Z19 class
A class Z19 locomotive (no.1905) at the Trainworks Rail Museum in Thirlmere, NSW
Type and origin Power type Steam Builder Beyer, Peacock & Co. Build date 1877–1891 Total produced 80
Specifications Configuration: ​  • Whyte 0-6-0  • UIC Cn Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 4 ft 1⁄2 in (1,232 mm) Loco weight Original: 75,000 lb (34,000 kg); Rebuilt: 84,000 lb (38,000 kg) Fuel type Coal Firebox:  • Firegrate area Original: 14 sq ft (1.3 m2); Rebuilt: 18 sq ft (1.7 m2) Boiler pressure Original: 130 psi (0.90 MPa); Rebuilt: 150 psi (1.03 MPa) Heating surface Original: 1,275 sq ft (118.5 m2); Rebuilt: 1,320 sq ft (123 m2) Superheater None Cylinders Two, inside Cylinder size 18 in × 24 in (457 mm × 610 mm)
Performance figures Tractive effort Original: 17,900 lbf (79.6 kN); Rebuilt: 20,655 lbf (91.9 kN)
Career Operators New South Wales Government Railways Class A93 (Z19 from 1924) Disposition 4 preserved, 76 scrapped

The Z19 class (formally A.93 class) was a class of steam locomotive built for and operated by the New South Wales Government Railways of Australia.^[1]

History[]

Class Z19 (A93) locomotive being delivered at Pyrmont

By 1877, the main lines in New South Wales were nearing Tamworth, Wagga Wagga and Orange. The additional distances required an increase in motive power, especially as at that time, locomotives were changed after quite short journeys. They were only in service when manned by their regular crew.^[2]

Between 1877 and 1881, the initial order of 50 of these 0-6-0 wheel arrangement locomotives were delivered from Beyer, Peacock and Company. Between 1880 and 1891, Beyer, Peacock delivered a further nine and local manufacturer, Henry Vale and Company eighteen.^[2][3]

A Class Z19 locomotive in service

The load which these locomotives could haul over the Blue Mountains line was 128 tonnes at 11–13 km/h. William Thow, the then Locomotive Engineer of the South Australian Railways, was commissioned by the New South Wales Government in 1888 to enquire into the New South Wales Government Railways locomotives and rolling stock.^[4] He recommended modifications to this class as he considered them to be the best designed and proportioned of the locomotives then in service. This included Belpaire boilers and new cabs.^[3]

Following the reclassification of locomotives in 1891, three additional similar locomotives were added to the class. With the arrival of the T class saw the class relegated to secondary roles and coal services in Newcastle. Between April 1902 and February 1910, fourteen were converted to 20 class 2-6-4 tank engines at Eveleigh Railway Workshops. By 1933 many had been withdrawn, with only 36 remaining in service.^[5]

1909 on a short goods train passing Broadmeadow

Having a short wheelbase and no leading bogie, the locomotives had a tendency to derail and they were ultimately restricted to a maximum speed of 40 km/h and relegated to shunting and branch line traffic. Driven slowly, they could negotiate the most appalling curves and badly maintained or unballasted tracks. They were therefore ideal in goods yards, such as Darling Harbour and Port Waratah with the last two withdrawn from the latter in August 1972. Branch lines such as those to Dorrigo, Batlow and Oberon where grades of up to 1 in 25 (4%) and curves as sharp as 100.6 m (5 chains) radius could be encountered were ideal for this class and these were the only locomotives permitted on these lines until dieselisation.^[3][5]

Preservation[]

Four locomotives of the class have been preserved:

References[]

Wikimedia Commons has media related to New South Wales Z19 class locomotives.