tysm now my city looks like better

Best invisible power line on the workshop, since it is an actual network. Great work!

Do these connect to regular line and pull them into the ground?

Well, they are called invisible for a reason.

how to delete them ?

I just DLd it. I want to try it. I use those current/breaker boxes. They have a large affect and can be used like power lines. but would like something that can be "strung" like wires but underground without lots of horsing around.