Starting from this week, RMV will partially switch to vacation schedule. This would mean that there will be less number of S-Bahn and U-Bahn running in Frankfurt and nearby regions.
Ab Mitte nächste Woche verkehrt der Nahverkehr ausgedünnt. Informationen dazu werden nächste Woche folgen. /jn
— Deutsche Bahn Personenverkehr (@DB_Bahn) March 15, 2020
According to the RMV , there may now be restrictions on operation and cancellations on VGF subway and tram lines in Frankfurt.
More information regarding this can be found out at Frankfurt Neue Presse website -
https://www.fnp.de/hessen/coronavirus-deutsche-bahn-db-rmv-bus-bahn-hessen-frankfurt-offenbach-wiesbaden-sicherheit-zr-13597566.html