Hacker News Reader

The Paris metro figured this out perfectly way back in 2021 - full bars, 5G.

The Paris metro is mostly cut-and-cover. It isn't very deep. The deepest tube lines are around 60m underground.

Are you suggesting the mobile signal comes from above the ground in Paris?

No. I'm suggesting it is easier and cheaper to retrofit equipment. Not to mention dealing with the extra heat.

Pulling the cables down the service shafts from the surface is not the hard part either way.

Stockholm has had 3g in the entire subway system since 2005. Which has then been continuously upgraded. With some very deep lines.