| Weight | 50t |
| Driving Wheels | 4ft 0ins |
| Boiler Pressure | 140psi |
| Cylinders | Two Outside – 18½in x 26in |
| Tractive Effort | 22,060lbf |
This locomotive was built by Beyer Peacock in Manchester in 1884as one of seventy engines constructed for to the NSW Government Railway between 1881 and 1885. They became the B205 class which was reclassified as the Z25 class in 1924.
The first 50 units had open cabs, round-top boilers and Salter safety valves. From February 1901 all of the class were fitted with larger Belpaire boilers which increased their weight and also increased the heating surface. They were also rebuilt with wooden cabs. The locomotives delivered in the final order of 20 had cut-away cabsides,.
In the late 1880s, the class were based at Sydney, Goulburn, Penrith, Bathurst, Newcastle, Murrurundi and Armidale.
In 1896 the locomotives were relegated to lighter branch line duties when they were replaced by newer more powerful locomotives.
The Great Depression resulted in about 30% of Australian workers being unemployed by 1932 and this obviously affected the demand for goods and the movement of raw materials. As locomotives became due for overhaul many were left to become derelict. Some were used during the load testing of the Sydney Harbour Bridge in 1932 as part of the commissioning of the bridge.
The locomotive was sold to Australian Iron & Steel (AIS), After being taken out of service with AIS it was initially placed on a plinth at the Visitors Centre at Coniston. When it was placed on the plinth the lifting chains were poorly positioned under the locomotive which resulted in the running board being buckled and possibly the frames damaged.
The locomotive suffered from being left in the open air and was under the threat of being scrapped before it was acquired by the Dorrigo Steam Railway & Museum (DSR&M) in the mid 1970s. It was subsequently transferred to Rhondda Colliery, near Newcastle, for storage.
In the mid 1980’s the locomotive was moved to Dorrigo where it remains in storage. The Dorrigo Steam Railway & Museum in Dorrigo is a large, privately owned collection of railway vehicles and equipment. The museum was opened very briefly in 1986 but has not been open to the public ever since. The locomotive is stored at the Dorrigo Steam Railway & Museum.
One other members of the class built by Beyer Peacock are preserved.
- 2510 – Beyer Peacock works number 2082
Preserved British Steam Locomotives 