Hutt Valley and Kapiti train commuters can soon relax with 1000 new seats and extra services in peak times from Tuesday.
Increasingly unreliable 60-year-old trains have been fully replaced, ending a nine-year project to replace carriages on the passenger rail service in the region.
It includes 25 refurbished carriages that cost $25 million and 83 sets of two-car Matangi units worth $406m.
"We're following a simple formula: when there is a comfortable, reliable and punctual service, more people use public transport," Greater Wellington Regional Council's public transport leader Paul Swain said.
Since the first Matangi units were introduced in 2012, an additional 1 million train journeys have been recorded.
The council is now moving on to the region's bus services, with contracts currently up for tender.
Improved bus services are expected to be in place by mid-2018.