In 1975 it again became part of MÃ nchengladbach . The central station , Rheydt Hauptbahnhof , kept its original name , which makes MÃ nchengladbach the only city in Germany to have two stations called Hauptbahnhof . After merging with MÃ nchengladbach , the central station ( Rheydt Hauptbahnhof ) kept its original name , making MÃ nchengladbach the only city in Germany to have two stations called Hauptbahnhof .