Dave, would it be possible to add an option to allow both normal and bold (thick) track center lines?
This would be nice for showing mainline vs sidings/yards.
If showing roadbed, then maybe revert to normal if it looks like too much.
I can see one problem with that, and that is the fact that the choice of track display format is a universal one, not specific to individual pieces of track. Your best bet for what you want is probably to use coloured Sections. The colour will still show up, even in Centreline mode.
Nick the Nomad
Currently settled in Geelong