Beijing authorities unveiled plans for four new subway lines with a total investment of US$6.01 billion. The project involves the construction of almost 104 km of new track, including a branch line designed to serve the site of the 2008 Olympic Games. Officials said that some 30% of the cost � around US$1.81 billion � would come from private investment. As part of a cooperative operating company managing the lines, private investors would receive revenue from ticketing, advertising and commercial rentals for a specified license period before the company is handed over to full government control.