Prime Minister Malcolm Turnbull speaks during a visit to the Omni tanker manufacturing business in south-west Sydney on Thursday. Photo: Andrew MearesElection 2016: full coverage

Two announcements, both alike in identity, in fair Campbelltown, where we lay our scene.

A day after Labor leader Bill Shorten visited and promised $50 million to upgrade a notorious stretch of the Appin Road, Prime Minister Malcolm Turnbull ventured to the same seat to make exactly the same commitment.

While both parties addressed road safety, Mr Turnbull used the announcement to emphasise his push on infrastructure and housing supply, arguing the upgraded road would “unlock 35,000 new homes”. He said 1800 of those homes would be available “almost immediately”.

But there is no plan for federal government investment in schools or health services in the rapidly-growing region, with Cities Minister Angus Taylor saying those were matters for the Baird state government.

“We invest in roads – that’s what we do. Schools and health are a state responsibility, we don’t invest in schools,” Mr Taylor told Fairfax Media.

“We do support new schools in this region with our funding model.

“The critical thing for now is to make sure our road investment happens in parallel or ahead of housing developments. That’s the priority for this region.”

The final version of the Greater Macarthur Land Release Strategy is pending, but the preliminary version forecast the creation of 35,000 new homes in Menangle Park, Mount Gilead and Wilton, all south of Campbelltown.

The adjacent growth centre around Leppington will also be home to around 300,000 new residents, according to government projections, to be boosted by the Western Sydney Airport.

“There is a city the size of Canberra being built in this region,” said Mr Taylor, whose seat is the neighbouring electorate of Hume.

“My job as minister for cities, and as a local member, is to make sure the infrastructure happens in parallel, not behind.”

Since he took office, Mr Turnbull has touted increased housing supply and greater population density as the solution to the housing affordability crisis. The Appin Road upgrade would facilitate a “very substantial increase” in housing supply, he said on Thursday.

The PM has also pivoted the government’s position on infrastructure to embrace rail and public transport, as well as roads, which was the focus of his predecessor Tony Abbott. Mr Turnbull caught a train to and from Macarthur for Thursday’s announcement.

Not included in either party’s announcement was money for two other infrastructure provisions outlined in the Land Release Strategy; a priority bus corridor in Gilead and the electrification of the rail line from Macarthur to Menangle Park.

The electorate of Macarthur is shaping up as a key election battleground; the PM has been there twice in the past week. It is held by Liberal MP Russell Matheson and was a safe Liberal seat, but a redistribution has slashed the notional margin to just 3.3 per cent.

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