Answer:
"Railroad Tracks"? Do you mean the staff (five lines, not two)? Or do you mean what a couple of my directors used to call the "railroad crossing" (segno; it's a marking that looks like a crossed-out fancy S tilted sideways, or, if you're imaginative, something vaguely like a railroad crossing sign, and means "when you see the notation 'D.S.', jump back to here").