Rails have been located in Letitia Road, just past the Fingal Cemetery NSW. I knew where to find it as other members of the Tweed Heads Historical society photographed rail there in 2003.
Rail site in relation to cemetery https://drive.google.com/file/d/0ByB-ppGeDyvwT3dFU1liLW1zT1k/view
Rail with 2 x 20 cent coins a size scale https://drive.google.com/file/d/0ByB-ppGeDyvwREpZeTFHTzhQMkk/view