RB 23

RB 23 is the designation of several regional rail services in Germany:


 * , operated by DB Regio Mitte between Mayen Ost and Limburg (Lahn)
 * , operated by DB Regio Nordost between BER Airport – Terminal 1-2 and Golm
 * , operated by DB Regio Nordost between Züssow and Świnoujście Centrum
 * , operated by DB Regio NRW between Bad Münstereifel and Euskirchen
 * , operated by Oberpfalzbahn between Regensburg and Marktredwitz or Neustadt (Waldnaab)