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A comment on The U.S. economy is growing and using less and less stuff to do so. Parent comment

Re:The U.S. economy is growing and using less and less stuff... by simonrobb on Friday September 20, 2019 @11:26AM (#21027737)
Are concrete crossties pre-stressed? It makes sense now I think about it, but I'm just surprised more effort than "pour concrete into a mold" goes into such an unassuming structural member.
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Re:The U.S. economy is growing and using less and less stuff... by logfromblammo on Friday September 20, 2019 @04:20PM (#21030834)
I'd guess that poured concrete is not cost-competitive with timber crossties, and pre-stressing is the only way to make them cheaply enough to compete.
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