[rini17]

Roads and rails can have small gaps to allow for stretching from temperature changes. Pipelines solve this with U-shaped segments. Hyperloop can't do either, requires something with airtight-enough seals or some expensive materials.

At such high speeds as proposed, any sagging is impermissible (again, unlike pipelines). Of course it's solved engineering problem but it markedly increases the construction price and complexity.

So, no, hyperloop is not really comparable to pipelines.