KiwiRail's putting cracks in Auckland's rail network down to heavy usage

Walking inspections over the past two months revealed 34 faults across the 200-kilometre network.

KiwiRail Chief Operating Officer Todd Moyle says it's roughly what they expected.

He says they're planning to put more than 100 million dollar into it over the next four years - which will help make it more maintainable.

Auckland's rail network is increasingly busy, with almost 200-thousand commuter services each year, and 246 freight trains a week.