First guess (may be wrong) is to manage thermal expansion/contraction constantly... | Hacker News

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		probablypower 59 days ago \| parent \| context \| favorite \| on: A train-sized tunnel is now carrying electricity u... First guess (may be wrong) is to manage thermal expansion/contraction constantly on a micro-scale.

nraynaud 59 days ago [–]

I would also add that there some slack for repairs.

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