Circuit trim on underground belts

[fi5hii]

TL;DR

A yellow indicator on the underground belts when connected to circuits.

What ?

Would love to have the some yellow metal border like painted sides of the underground connector or same yellow indicator like there is on the side of the belt when you select to read the whole belt maybe just change the color of the trim or add on the same metal yellow "barrier".

Why ?

To have a clear indicator that the undergrounds are also being accounted for in that belt and see the connection all through the whole belt

[fi5hii]

I had something like this in mind, I think the same railing on the side of the underground would look the best

[mmmPI]

To me this looks good and useful

( i prefer the railing too )