An $880 million investment in technology improvements to modernise the Sydney Trains network will increase the number of trains at peak times on the T4 Illawarra Line and the T8 Airport Line.

NSW Premier, Gladys Berejiklian, said funding in NSW Budget 2018 will allow for five more trains an hour during peak times on the T4 Illawarra Line from Cronulla, a capacity increase of up to 30 per cent.

The technology improvements will also allow for eight more services an hour on the T8 Airport Line at the International, Domestic, Mascot and Green Square stations, meaning trains will run on average every four minutes instead every six, along with extra services from Revesby.

These upgrades will be delivered in stages with services coming online progressively from the early 2020s.

“At the moment our rail network is complex and reliant on old technologies which limits the number of services we can provide,” Ms Berejiklian said.

“That is why we are making significant investments to improve rail infrastructure and ensure we can continue to meet the growing demand for rail services.

“The T4 Illawarra Line and T8 Airport Line are the first beneficiaries of these signalling upgrades, which will be rolled out across the network – significantly boosting capacity and reliability for all train customers.”

Treasurer, Dominic Perrottet, said the investment in this technology was an important step in boosting capacity of existing transport assets.

“We have all had the experience of waiting on an overcrowded platform, so this technology investment will contribute to increasing services and making journeys more comfortable,” Mr Perrottet said.

Minister for Transport and Infrastructure, Andrew Constance, said the program will start to upgrade parts of the network with state-of-the-art digitalised signalling and control systems used by some of the best railways around the world.

“While we’re building the world-class Sydney Metro, it’s important we take action to bring the existing suburban, intercity, and freight services into the 21st Century.

“We are investing in this signalling technology to get more trains on the tracks. Turning old rail into new rail,” Mr Constance said.

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