| 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 1881as 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.
This locomotive was one of the first to be saved for preservation by the New South Wales Rail Transport Museum (NSWRTM).
It received a very thorough and lengthy static restoration by a group of NSWRTM volunteers and is proudly displayed in the main exhibit hall at Trainworks, Thirlmere.
One other members of the class built by Beyer Peacock are preserved.
- 2535 – Beyer Peacock works number 2322
Preserved British Steam Locomotives 