Whereas declines usually occurred in months when there were fewer working days than the comparative period, Mr Lee said there were more of those last month than in May last year. "It just reinforces we are dealing with a market made up of people who have choices," he said, regarding last month's rail patronage figure - which was in contrast to an overall 8.7 per cent increase in public transport trips, including 13.6 per cent on the ferries.
"We have to think about the quality of the offering."
He blamed the time trains took to disembark and load passengers at stations, as well as continuing signals failures, a KiwiRail responsibility.
Auckland Transport chief executive David Warburton said time-keeping needed to be more rigorous.
People had to get used to trains not waiting for them if they were 30 seconds late. Dr Parton acknowledged services had to become more attractive, saying an Auckland Plan target of doubling public transport to 140 million annual passenger trips by 2022 was "a major ask and it's not going to happen by accident".
But during an inspection of a "mock-up" electric train carriage, Auckland Mayor Len Brown hailed the new fleet being built for the region for almost $500 million as an example of what was needed to meet the goal.
"We've got an old system we've been looking to replace for years and we're finally at that point," he said.
The first of 57 three-car trains to be built in Spain are due to start running in Auckland in 2014.