RB 51

RB 51 is the designation of several regional rail services in Germany:


 * , operated by agilis between Neumarkt (Oberpfalz) and Plattling
 * , operated by DB Regio Mitte between Frankfurt (Main) and Wächtersbach
 * , operated by DB Regio Mitte between Neustadt (Weinstraße) and Karlsruhe
 * , operated by DB Regio NRW between Enschede and Dortmund
 * , operated by DB Regio Südost between Dessau and Falkenberg (Elster)
 * , operated by Ostdeutsche Eisenbahn between Rathenau and Brandenburg