someone made this; https://forums.factorio.com/viewtopic.php?f=87&t=12836

it's not underground, but it does make it possible to have trains drive through your buildings

Edit: i don't know if the mod is still active and supported, maybe someone can work with this if its not a active mod anymore ...

Hello mod makers,

i was wondering if there is a possibility for Wireless Ciruitnetworks with a channel system,

like if you make the channel "blue1" only information from all the blue1 poles goes to blue1 and not red1 or something,
instead of a pole showing all my iron, i want to see how much iron ...