Auckland Transport has been accused of using a "crude delaying tactic" to avoid releasing the cost of an inner-city rail link.
The agency wants thousands of dollars to disclose the numbers in its City Centre Future Access Study released in December. It assessed rail infrastructure as the most cost-effective solution to Auckland's transport woes.
Wellington analyst and transport advocate Tony Randle took apart a previous study on the Auckland CBD rail link after its release in 2010.
Randle complained to the Ombudsman after Auckland Transport asked for almost $4,000 for access to the analysis used to write the business case. It then agreed to hand over the spreadsheets, in which Randle found previously undisclosed information that put the benefits of a rail link in doubt.
The running cost of a second purchase of 26 trains was omitted and the cost of a second bus tunnel was included without explanation.