The C38 class was a class of steam locomotives built for the New

South Wales Government Railways in Australia.

    Built between January 1943 and November 1949, the 30 locomotive
in the class were designed to haul express trains. They were the only
New South Wales locomotives to use the  Pacific 4-6-2 wheel arrangement
and were the last steam locomotives built for passenger train operations.

    The C38 class was first conceived in the 1930s being heavily influenced
by North American and other streamlined locomotives of the time. The NSWGR
needed a locomotive to eliminate the complications of double heading required
on a number of fast interstate passenger trains.

    The design team was headed by Harold Young, the Chief Mechanical
Engineer of the NSWGR. The conditions of trackwork with frequent sharp
curvature to be traversed at high speed would require six-coupled driving
wheels  in a 'Pacific' 4-6-2 configuration. Maintenance considerations
suggested a two-cylinder simple steam locomotive.

    In May 1939 an order for five 38 class locomotives was placed with
Clyde Engineering. These locomotives suffered many delays during
construction, mostly due to resource shortages caused by World
War 11. The first five locomotives, built at Clyde Engineering had a
distinctive streamline boiler casing. The remaining twenty-five locomotives
were built at the New South Wales Government Railways' Eveleigh Railway
Workshops(13 even numbered locomotives ) and Cardiff Locomotive
Workshops (12 odd numbered locomotives)

    The Clyde Engineering built examples were delivered in wartime grey.
At the end of the war, all were repainted green as were the twenty five
un-streamlined locomotives from new. All except 3813 were repainted
black in the 1950s.

    Among the services they initially hauled were the Central West Express,
Newcastle Flyer, Melbourne Limited, Reverina Express and South Coast
Daylight Express as well as the overnight mail trains. Because of their
axle-load they were confined to operating between Port Kembla, Albury,
Dubbo and Maitland.

    Following the arrival of diesel locomotives in the 1950s the C38s began
to haul lesser passenger and freight trains and  were gradually phased out.  
In April 1962 3830 and 3813 hauled the in-augral standard gauge Spirit of
Progress from Albury to Sydney. In August 1970, 3801 hauled the Western
Endeavour to Perth following the completion of standard gauge Trans
Australian Railway with 3813 assisting as far as Port Pirie. In April 1988, 3801
again operated to Perth during the Australian Bicentenary.

    The first C38s were withdrawn in 1961 and the last was withdrawn in
December 1970.

    Source:  Wikapedia

Technical Details for un-streamlined and streamlined

Brass contstruction
Working head lamp with separate switch
Axle water pump with bypass valve
Water hand pump with check valve
Water gauge with drain valve
Adjustable safety valves (first working safety valve pops at 60-65PSO)
(Second working safety vavle pops at 75-80PSI)
Working whistle
UK Imported pressure gauge