Sydney is getting extra train services to cater for an expected increase in passengers when the city's first metro line opens in May.
The first stage of the NSW government's driverless train project links the city's northwest to Chatswood with passengers then able to jump onto the heavy rail network into the city.
NSW Transport Minister Andrew Constance is expecting a bump in passengers travelling from the northwest and the lower north shore to the city, with 70 new weekly trains services to run from April 28 to cater for the demand.
A train will run every three minutes from Chatswood into the city during the morning peak and extra services will run during the evening.
"We are making changes to the transport network to ensure the integration works very smoothly," Mr Constance told reporters in Sydney on Friday.
"We do need people to work with us for what is going to be a very difficult and challenging time as we do make adjustments."
The metro service will also feature new graphics on the electric noticeboards on platforms to show people how full carriages are.
Tunnelling for the second stage of the metro is underway which will link Sydenham to Chatswood via the city. It's due to be completed in 2024.