The NSW government promises trains will run up to every four minutes on Sydney’s North West Rail Link once construction is completed in five years.
Premier Mike Baird and Transport Minister Gladys Berejiklian have signed a $3.7 billion contract for the project, which includes 15 trains an hour during peak periods and a train every 10 minutes during off-peak and weekends.
"Our customers tell us that frequency of services is one of the most important factors when travelling on public transport," Ms Berejiklian said on Tuesday.
The rail line will run from Rouse Hill through the Hills district to Chatswood, connecting to the existing rail line at Epping.
Trains will be able to carry more than 1000 people with approximately 400 seats, including areas for prams and wheelchairs.
The trains will be built overseas by international train supplier Alstom, but Ms Berejiklian promised the project will create jobs in NSW.