I would also like to follow RFI and usually I check my other changes against ePIR, unfortunately their classification in rete fondamentale / rete complementare is a bit arbitrary and tied to their internal history and processes. A current example: Bressanone - San Candido is branch for RFI, San Candido - Lienz is main for OeBB. It does not make sense, so I think we should ask ourselves, what do we want to really represent in the map, because plainly reflecting the internal classifications of the different owners will not end well.
Shall we discuss further in the wiki page linked above? :-)