The Mount Mulligan mine disaster killed 75 workers in 1921. In 1922, the Queensland Legislative Council was abolished, making Queensland the only Australian state (to this day) without a bicameral legislature. On 9 June 1925 the Traverston rail disaster occurs – the worst rail disaster in Queensland's history until 1947. In 1927, the Duke and Duchess of York toured Queensland. They were here to open Parliament House in Canberra but spent time in southern Queensland to meet and greet people. In 1928, the Royal Flying Doctor Service of Australia makes first flight, departing from Cloncurry. Also, in 1928, Sir Charles Kingsford Smith landed the "Southern Cross" in Brisbane, completing the first trans-Pacific flight. In 1935, 101 cane toads were brought into Queensland to try to control pests on sugar cane crops, and bred to 3,000, which were released into areas around Cairns, Innisfail and Gordonvale. They have since spread to many parts of Queensland, New South Wales and the Northern Territory. In late 1936 a lightning strike hit the Bundaberg Rum Distillery, destroying the distillery without any loss of life. It was rebuilt and is currently operating on the same site today.