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New KiwiRail tracks too narrow for trains
(www.odt.co.nz)
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this post was submitted on 20 Feb 2024
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The second part of the article is about heat restrictions. I watched a video a few weeks ago about why train tracks don’t need expansion joints anymore and mitigating heat issues. Sounds like the people in charge in New Zealand need to learn about these advances.
I would caution that there's a fair gap between "don't need expansion joints" and "don't have heat restrictions". A few days a year of heat restrictions could be considered a reasonable engineering trade-off, if it manages costs
I’m not an expert by any means, but the engineer who makes the videos spent a good bit of time talking about the importance of building for the hottest days and how they do that. I don’t remember now if he talked about heat restrictions on speed, but the point was definitely about minimizing deformations to the track.