Dear KiwiRail,

Given that in a previous answer (OIA2016.066) you stated that KiwiRail "does not record what the relevant kilometre distance was at the time that a fault is logged", could you please advise how the Mean Distance between Failures is calculated for the KiwiRail locomotive fleet.

Could you also provide the data behind the calculations for the mean distance between failures, to a level of detail at which individual locomotives are identifiable. This should be for the entire locomotive fleet since 2010.

As I do not know the exact form of such information, I am happy to establish what information would address my request. Under section 18B of the Official Information Act it is your duty to do so.
If a request is likely to be refused under section 18(e) or (f), the department, Minister of the Crown, or organisation must, before that request is refused, consider whether consulting with the person who made the request would assist that person to make the request in a form that would remove the reason for the refusal.

Yours faithfully,

Tim Frank

Dear KiwiRail,
Unfortunately, this request was sent twice. Please ignore this request and respond only to the other request with a similar reference.

Yours faithfully,

Tim Frank