I have to agree this would make life a lot easier if this was possible.
Also would be nice to be able to deconstruct only stone and concrete floors and not the machines above.

it's the entry+internal signals that must be chain signals This is correct. You really only need three chain signals in a well constructed T junction though - one for each path that requires crossing over other tracks. Here's an example: There's no reason to separate the three crossing tracks (form...

I have one chain signal that wont work where it is placed I was hoping some one could explain to me why its not working where I placed it.