High Quality Content by WIKIPEDIA articles! Cross River Rail is a proposed new underground rail line in Brisbane, Australia. The project involves building a new 18 km railway under the Brisbane River and the Brisbane central business district, creating four new underground inner city stations, and increasing the core capacity of the rail network. According to the Premier of Queensland, Anna Bligh the railway will be the largest transport project ever built in Queensland. The project is expected to cost around $8.2 billion.