Wollongong will get a train every 15 minutes during peak hour, and all those trains will come with 10 carriages - but you'll have to wait two years.
Transport Minister Andrew Constance visited Helensburgh station on Wednesday morning to announce a number of promised improvements to the South Coast line.
Also on the cards is a doubling of 22 trains in and out of Kiama on weekends from four to eight carriages.
That will happen from January 1 and Mr Constance said it would mean a boost in capacity of 20,000 seats.
For Wollongong commuters, the ministers pledged to deliver more express services to and from Sydney.
"We’re now going to have an express train every 15 minutes out of Wollongong in the morning and afternoon peaks," Mr Constance said.
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Those peak-hour services will be made up 10 carriages.
The two-year wait for this upgrade was because it would be delivered via the New Intercity Fleet, which is now being built.
To cater for "a growth explosion" in commuter journeys on the South Coast line, the government has ordered an extra 42 carriages - the majority of which has been "earmarked" for the Illawarra, Mr Constance said.
"In the next two years we'll start to progressively get those trains and we’ll start to roll them out across the network," Mr Constance said.
"We’re expecting to see this uplift in services in 2021 in terms of the New Intercity Fleet procurement."
Mr Constance said this meant Illawarra commuters would see the New Intercity Fleet on the South Coast line earlier than the previously announced 2021 arrival.
The 10-car New Intercity Fleet peak hour trains will still hold fewer commuters than the Oscars now on the network - around 800 compared to 864.
But Mr Constance said that would be cancelled out by a boost in service frequency.
"Because we're bolstering the service frequency it does mean more seats, 25 per cent more," Mr Constance said.
NSW TrainLink CEO Howard Collins said he was looking for service improvements that could be made before the 2021 arrival of the New Intercity Fleet.
"We are looking at changes of longer trains, we’re looking with our colleagues in Transport what other things we can do when it comes to timetable planning," Mr Collins said.
"We are limited by the capacity of the existing network particularly in this area, as we share the corridor with freight but we’ll be looking at how we can enhance and improve services."