I made a new S-Bahn/U-Bahn map based on the proposal of a Ringbahn on the existing Nord and Südring : r/Munich
Jon Worth on Twitter: "Interrail pass for flexibility + BahnBonus Status / BahnComfort allowing me to use the special seats that aren't reserved + Bahn: Fahrplan & Live Tracking App to know
Bahn: Fahrplan & Live Tracking - Apps on Google Play