The New Zealand Transport Agency says an integrated ticketing system being developed for public transport in Auckland is likely to be adapted in other regions.
The system uses a smartcard, known as a HOP card, and is being gradually introduced in Auckland over the next few weeks.
Eventually passengers will be able to use the card on trains, buses and ferries.
The agency owns the system and says that means it can be duplicated elsewhere in New Zealand.
NZTA spokesperson Andy Knackstedt says the system could ultimately allow a passenger to use their smartcard for public transport in any city where it is installed.