I have a grade crossing on my M-track layout using Grade Crossing 7192 with barriers. It is fine (and vintage!). For my dc trains I have easily made grade crossings using the "Sculptamold" product for the approach and the track area. I am very hesitant to do this with M-track. I am thinking of just using heavy construction paper to fill in the track area between the running rails and the center stud and for the approach to the roadbed and trackage. Has anybody made grade crossings for Märklin track? How have you done this? Thanks.