Hunter said a trial of the integrated HOP card across trains, ferries and buses would begin next month.
Veolia customer service manager Nick Orange said 2 to 3 per cent of passengers did not currently pay for their train rides.
A survey was undertaken last Tuesday in which passengers' tickets were checked before they could leave key Auckland stations.
"Although the figures are relatively low, we are concerned about fare evasion as the revenue we collect via train fares goes directly towards maintaining the fleet and the rail network, as well as funding improvements such as new electric trains," Orange said.
He added that fare-evasion levels had dropped recently, although patronage on Auckland trains had increased from 8.9 million last year to 10.8 million this year for the 12 months ending October 31.
"Customers are very understanding," said Orange, "and fare-evasion rates have fallen since we began regular monitoring."