The five-year extension, effective from July 1, replaces the two-year extension announced on January 30 and will provide heavy maintenance, component overhaul and supply chain capabilities, along with engineering and depot-related support.

The extension will generate approximately $A 630m ($US 441.7m) in revenue, replacing the $A 277m in revenue announced in January.

The services will be delivered through UGL Unipart, a 70:30 joint venture between UGL and Unipart Rail UK.

UGL will provide asset management and maintenance capability and knowledge of Sydney’s metropolitan passenger fleet, while Unipart Rail UK will provide supply chain services.