NS Dash9's have no rear number boards, just painted on numbers where the boards would be, usually using the same font as the cabside number.
http://www.railpictures.net/viewphoto.php?id=212228&nseq=16
http://www.railpictures.net/viewphoto.php?id=212122&nseq=23
Bill
"Never try to teach a pig to sing. It wastes your time and annoys the pig"