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The project will extend three platforms, modernise signalling and tracks, and allow for more frequent, reliable rail services.
The rail link is expected to carry 16 million tonnes of phosphate and potash annually and cut transport costs by $40m.
The consortium will oversee the design, construction and long-term operation of the D35 motorway section.
The new facility will offer expanded educational, arts and sports spaces while preserving historic elements of the current site.
The contracts will see five hotels and three residential assets constructed as part of Diriyah Square’s ongoing development.