I used Paper terrain for some 10mm railway track. the smallet they do i 10mm, but you can scale it down with a colour copier.
I stick mine onto self adhesive tiles from a DIY store. Tticking them to the adhesive side then cutting them out, this made them more robust.
It cuts easily, and if you chose your tile colour (plain grey or brown) that is the underside of the rail tracks you can turn them over to use as roads/tracks.