A ticket blitz was held at Middlemore railway station in Auckland on Thursday for commuters travelling without tickets.
Barricades are in place and people are being checked to see if their fares have been paid.
Usually people are required to swipe an electronic card at the station, but there is nothing to stop them simply walking off.
Auckland Transport estimates that ticket evaders cost an estimated $5 million per year.
Chief operations officer Greg Edmonds said any one caught is asked to pay a $20 penalty. However, they are not required to by law.
Auckland Transport has asked Parliament to consider imposing an fine which Mr Edmonds would like to be about $150.
Only one person was caught on Thursday and he refused to pay the $20 penalty.