KiwiRail Holdings P11 Frame

KiwiRail Holdings P11 Frame

KiwiRail gave us a call when they needed to gain certification of their newly designed railway bogie.  They knew we could design a test programme that would satisfy the rigorous international certification requirements. Thirty-five million load cycles and three months later the bogie was proven compliant and the system is now in daily use on New Zealand's TranzAlpine and Coastal Pacific rail lines.

KiwiRail Holdings P11 Frame

When KiwiRail required experimental testing to gain compliance for New Zealand's first passenger railway bogie - the P11 frame - they knew we could help. The project required careful application of cyclic fatigue loading simultaneously in three planes, with the addition of a twist displacement. This had to be repeated over 30 million loading cycles, simulating a lifetime of applied loading.  We enjoy a challenge, and this project posed some serious issues, including how to design and fabricate suitable testing equipment that could handle the rigours of the testing!

We worked extensively with KiwiRail to design and manufacture the equipment required to meet the rigorous international criteria and then completed all necessary testing.  The equipment worked seamlessly over a three month period, allowing the testing to be completed within the allocated timeframe. This was the first time a project of this nature was completed in the Southern Hemisphere.


Using the outcomes of the testing KiwiRail gained full compliance of the bogie system, which now sees it in daily use on the TranzAlpine and Coastal Pacific rail lines. The ease at which the system gained compliance was a testament to the quality of the testing and our commitment to understanding KiwiRail’s requirements.

If you would like more information regarding our services, please contact us on +64 3 363 2180 or email

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Did you know?

The Arthurs Pass tunnel that the TranzAlpine train passes through uses forced-air ventilation to prevent steam trains from suffocating and losing power while in the tunnel.