Auckland's transport agency has launched its new $100 million public transport ticketing system.
The new AT Hopcard service formally starts for train journeys on Saturday and will eventually be extended to ferries and buses.
Auckland Transport spokesperson Greg Edmonds says the multi-million dollar project has taken three and a half years.
He says about 100 extra staff will be on duty during the first week to ensure the transition goes smoothly.
Mr Edmonds says about 7500 Hop cards have been bought so far.
On weekdays about 20,000 people use trains in Auckland.