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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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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.