The second phase of the southern sector conversion would see two of the four tracks between Sydenham and Hurstville, part of the Sydney Trains Illawarra line, converted to rapid transit and added to the Sydney Metro network. This would increase rail capacity between Hurstville and the city by 10 trains per hour. Though a precise construction timeframe was not provided, the plan envisages all work being completed by 2031. The Hurstville conversion would add eight stations and 9 km (5.6 mi) to the metro network. Developing plans for this extension has proven difficult, and the Sydney Morning Herald reported in February 2016 that the project may have been dropped.

The second phase of the southern sector conversion would see two of the four tracks between Sydenham and Hurstville, part of the Sydney Trains Illawarra line, converted to rapid transit and added to the Sydney Metro network. This would increase rail capacity between Hurstville and the city by 10 trains per hour. Though a precise construction timeframe was not provided, the plan envisages all work being completed by 2031. The Hurstville conversion would add eight stations and 9 km (5.6 mi) to the metro network. Developing plans for this extension has proven difficult, and the Sydney Morning Herald reported in February 2016 that the project may have been dropped.