Locomotive, full size, steam, No.1243, metal / glass, made by Davey and Company, Atlas Engineering Works, Hay Street West, Sydney, New South Wales, Australia, 1882
The design of Locomotive 1243 was close to the British 23 class locomotives of the time with a short free steaming boiler and a high ratio of heating surface in relation to tractive effort. This made it ideal for relatively level roads. In keeping with the British 23 class, the locomotive had a raked smokebox and polished brass helmet dome with Salter safety valves. A different feature of the New South Wales-built engine is the leading four-wheel Bissel bogie, instead of a two-wheel pony truck which gave 20% more tractive effort.
The locomotive was modified in about 1899 to improve its steaming capacity. A Belpaire (flat top) boiler replaced the original round top boiler, the raked smokebox was made upright, and a standard cast funnel was added. Following this a new extended smokebox was installed in 1967.
The valve gear is internal of Stephenson's configuration and the Westinghouse brake pump is fitted to the left-hand side of the smokebox. Although originally a green livery the locomotive is now finished in black.
Builder: Davey and Company, Atlas Engineering Works, Hay Street West, Sydney
Date built: 1882
Type: tender type, standard gauge
Wheel arrangement: 4-4-0
Class: C-79 later Z12
Number in class: 68
Date in Service: 1882-1955
Tractive effort: 13 100 lbs (58 268 N)
Boiler pressure: 140 p.s.i. (965 kPa)
Cylinders (2): outside, 18 in x 24 in (457 mm x 609 mm)
Steam Pressure: 140 lbs (965 kPa)
Valve Gear: Stephenson's
Leading wheels: 36 in diameter (914 mm)
Driving wheels: 5 ft 6 in diameter (1 676 mm)
Heating surface: Firebox: originally 87 sq. ft (8 sq. m) later 94 sq. ft (8.7 sq. m)
Overall length: 27 ft 11 in (8.5 m)
Overall height: 13 ft 6 in (4.1 m)
Overall width: 9 ft (approx.) (2.7 m)
coal: 4.5 tons (4 600 kg)
water: 2000 gals (9 000 litres)