Printed from https://fyi.org.nz/request/33305-locomotive-mean-distance-between-failures-mdbf?unfold=1 on January 30, 2026 11:20

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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

-----Original Message-----
From: LJ Holden <[FOI #33305 email]>
Sent: Wednesday, December 17, 2025 1:55 PM
To: KiwiRail <[email address]>
Subject: Official Information request - Locomotive Mean Distance Between Failures (MDBF)

CAUTION EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe.

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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