Channel Tunnel operator Eurotunnel achieved one billion euros in turnover in 2013 for the first time, the company said on Wednesday. That was an increase of 10.0 percent from the 2012 figure to 1.09 billion euros ($1.48 billion). The main reason for the growth in traffic was performance by rail freight operator Europorte, which turned in a year-on-year increase of 13.8 percent. High-speed train traffic through the tunnel increased also, by 1.3 percent. The tunnel runs beneath the sea between northern France and southern England.