Printed from https://fyi.org.nz/request/33305-locomotive-mean-distance-between-failures-mdbf on February 20, 2026 14:22

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Locomotive Mean Distance Between Failures (MDBF)

LJ Holden made this Official Information request to KiwiRail

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From: LJ Holden

Dear KiwiRail,

In 2023 I requested an updated spreadsheet of data held on locomotive Mean Distance Between Failures (MDBF). The data series KiwiRail kindly provided covered all locomotive classes up to December 2022.

Under the Official Information Act 1982, I request the same data series from January 2023 to the most recently available figures (i.e. the last two years of data).

Yours faithfully,

LJ Holden

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From: Laura Ratuva
KiwiRail

Kia ora LJ Holden

I wish to acknowledge receipt of your official information request for information on Locomotive Mean Distance Between Failures (MDBF).

We received your request on 17 December 2025, and will endeavour to respond to your request as soon as possible and in any event no later than 5 February 2026, i.e. the 20 working days after the day your request was received.

If we are unable to respond to your request by then, we will notify you of an extension of that timeframe.

Kind regards

Laura

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From: Laura Ratuva
KiwiRail

Attachment OIA2025 138 LJ Holden MDBF data.pdf
163K Download View as HTML

Attachment OIA2025 138 data release MDBF FY24 FY25.xlsx
67K Download View as HTML

Kia ora,

Please find attached the response to your OIA request.
I apologise for the slight delay.

Regards
Laura

Laura Ratuva   |   Senior Communications Advisor

Wellington Railway Station, Bunny Street, Wellington 6011 | PO Box 593, Wellington 6140, New Zealand

www.kiwirail.co.nz

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