"They are in a process of trying to rebuild rail," Braid said. "They go cap in hand for more capital funding to invest both in the network and the rolling stock. I guess we're in a process here where there has been an improvement in their services. We've committed to use rail more often. But they don't necessarily have the capacity to help us."
Alan Piper, KiwiRail's group general manager sales and commercial, said New Zealand's freight market is experiencing higher demand this year "which is a reflection of a buoyant local economy".
"Our priority this year has been meeting service and capacity requirements for our customers particularly in Auckland, Palmerston North and Christchurch," Piper said. "We are, however, also working with our logistics partners such as Mainfreight to create new capacity between Tauranga, Hamilton and the lower North Island and South Island markets, which are key growth areas for KiwiRail."
In April, the government released the December 2014 KiwiRail Commercial Review, which became the basis for its decision to maintain a national rail network, despite it having no prospect of running profitably. KiwiRail got a two-year, $400m funding package in Budget 2016 and said at the time that the government's investment in the business had allowed the railway to become "a more efficient and reliable supply chain partner" with a corresponding pickup in freight volumes.
Parts of the commercial review were redacted but among the material that was published, KiwiRail noted that its rail freight customer base "is weighted toward a small number of high-revenue customers".
"Many of these customers have invested alongside rail over recent years in a variety of ways including siding contributions, shed development, capital contributions to rolling stock and 'take or pay' agreements," the review said. "This is particularly true in the domestic freight market where modal options, capacity utilisation, price management and operational performance are critical opportunities (and risks)."
It also said that when KiwiRail started in 2008/2009 it owned "a fleet of rolling stock which was weighted towards the end of its economic life and prone to unreliability" while its locomotive fleet had an average age of 45, "resulting in poor reliability and costly and time-consuming maintenance requirements." The review also noted average 5 percent annual growth in domestic freight volumes over the previous five years, which was "a direct result of the investment it has made in rolling stock and improvements to the level of service KiwiRail provides."
Part of its strategy is to reduce the number of classes of rolling stock in its fleet to reap benefits from more standardised equipment.