Installation of around 1,600 pieces of pin-crib walling to the underpass at Stirling North.Installation in 60 hours to ensure no disruption to coal supplies from Leigh Creek.Design, manufacture, transport and installation of 13 large precast concrete culvert crown and 14 base sections for the underpass.Transport, distribution and tamping of 8,000 tonnes (7,900 long tons 8,800 short tons) of track ballast.10,000 screwspikes and 5,200 fishbolts.Laying of approx 11,500 sleepers comprising approximately 10,000 Redgum timber and 1,500 steel sleepers.Construction of six turnouts at Port Augusta to provide a run around loop and access to the storage shed and turntable.Earthworks requiring the excavation and placement of approximately 25,000 m3 (33,000 cu yd) of material dismantling, transport and relaying of 1,300 lengths of 12.2 m (40 ft) long rail totalling 500 tonnes (490 long tons 550 short tons).This arrangement saw the entire narrow gauge train loaded on top of a standard gauge train of flatcars and transported via standard gauge, then unloaded at the destination on to the existing narrow gauge. On the occasions that a narrow gauge train needed to travel to Port Augusta or to Marree, the train would need to utilise a piggy back system. This meant that the remaining narrow gauge line from Stirling North to Hawker via Quorn was now isolated. The narrow gauge component of the section dual gauge track between Stirling North and Port Augusta was removed once the standard gauge line to Marree was in full operation, and the narrow gauge route from Hawker to Marree had been closed and removed. A new standard gauge line to Marree was built in the 1950s on a new route west of the Pichi Richi Pass, with the purpose of bypassing the narrow gauge section of the Central Australia Railway to Marree, through Quorn and Hawker. Narrow gauge served the line to Quorn and the standard gauge, which branched at Stirling North, was for the line to Port Pirie and also to Marree. During the Commonwealth Railways era (from 1937 to 1957), the train line between Stirling North and Port Augusta was dual gauge.
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