There is recurring evidence indicating that standards of maintenance of rolling stock on the national rail network as demanded in Veolia's and KiwiRail's safety cases is lower than preferable and reasonable in that for example:
- manufacturers' inspection, repair and maintenance instructions are not always documented and followed
- safety critical components are not always identified and documented
- work instructions for maintaining safety-critical equipment are not always issued and work on safety-critical components is not always signed off by someone other than the maintainer
- some maintenance is not recorded.