Auckland Transport and police are discussing possible live video feeds from the city's new electric trains to combat soaring vandalism.
A monthly repair bill of about $50,000 is triggering a review of how on-board CCTV cameras can be used more effectively.
A 17-year-old is awaiting court sentencing after being identified among five youths who allegedly defaced 22 windows and the backs of 20 seats inside four minutes between Glen Innes and Panmure.
But the others have yet to be caught, raising a prospect of police and Auckland Transport monitoring live feeds from trains on high-risk sectors, rather than having to trawl through video files after offenders have fled.
Although offending around stations can be viewed on screens at a traffic management centre on Queens Wharf, "real-time" surveillance has yet to be extended to the 12 CCTV cameras inside each three-car electric train.