According to the new book "The era of the Bush Tram in New Zealand" by Paul Mahoney, the bush tram at Otaki Forks, New Zealand (wooden rails) operated a 100m section at 1 in 6 (and incidentally also had a 16ft radius curve). The line was operated by Fordson tractors mounted on railway wheels. John Browning John Browning Rockhampton Queensland Australia ceo8@rocknet.net.au