Good afternoon Lewis

 

Please find the attached.

 

As noted previously there is considerable fluctuation in the figures from
month to month, which means any analysis you make of the data should look
at long term trends.

You should also note that different generations of DL locomotives have
different MDBFs, with the later versions incorporating improvements which
have resulted in better performance.

 

Mean Distance between Failures is only one measure that is looked at when
assessing service performance. A more critical measure is whether a
failure affected a service or not, measured as a Service Affected Failure
(SAF). A SAF is a failure that affects a train service by more than ten
minutes.  Our focus is on the prevention of SAFs, as they are what affect
our On Time Performance and the service we can offer our customers.

 

Other factors that should be considered alongside the MDBF measurement are
what line a locomotive was travelling on, what sort of freight it was
carrying and whether it was a just in time or slower freight service.

 

As this information has been released under the OIA, you have the right to
seek an investigation and review of this response by way of complaint to
the Ombudsman. Refer to http://www.ombudsman.parliament.nz for more
information.

 

We trust this answers your query.

 

Kind regards

Dave

 

Dave Allard  | Senior Government Relations Advisor

DDI: 027 201 8182
Level 4, Wellington Railway Station, Bunny Street, Wellington 6011 | PO
Box 593, Wellington 6140, New Zealand

[1]Description: Description: cid:image001.png@01D46098.E77643D0

[2]www.kiwirail.co.nz

 

References

Visible links
2. http://www.kiwirail.co.nz/