A new Hamilton-to-Auckland passenger train service called Te Huia will start in early April.
Commuter trains last ran between the two cities in 2001 after an unsuccessful 16-month trial.
Central government funding for the new service was approved in December 2018.
Total funding of $78 million was allocated for the project over the first six years from 2019 to 2024, with $68.4m coming from the government and the remaining $9.8m from local government in the Waikato region.
Another $49m was used to purchase and modify rolling stock, reinstate a maintenance facility at Te Rapa and to construct a new station at The Base at Rotokauri and upgrade Huntly station.
In 2018, running costs were estimated at $5.82m per year with 75 per cent coming from a Transport Agency subsidy and the remainder split between passenger fares and Waikato Regional Council rates on Hamilton ratepayers.
The service was expected to start last year but was delayed by the Covid-19 pandemic and then track maintenance in Auckland.
Two return services will run each work day to Papakura, where commuters will transfer to local trains.
Trains will leave Hamilton at 5.46am and just before 6.30am, and return in the evening just before 5pm and again just before 6.30pm.
The trains, each with four carriages, will stop at Rotokauri and Huntly.
Regional Transport Committee and Rail Governance Group chair Hugh Vercoe said the service would transform public transport and the way people in Waikato travelled to Auckland.
''We are excited as our communities to be able to confirm a start date, giving people the certainty they need to start planning their travel from April."
"There's real opportunity for us to expand the service into the future, opening it up to even more Waikato communities."
The cost of a trip using a concession card will be $12.20 from Hamilton and $7.80 from Huntly.