\r\nMr Rodridgo Vila\u00e7a, head of CNT's rail division, says half the money should come from the government but the current level of commitment means the private sector will be left to bear up to 70% of the total cost.\r\n CNT looked at the 13 principal freight corridors, analysing traffic from 2006-2010. During this period, freight volumes rose from 404.2 million tonnes to 470.1 million tonnes, an increase of 16.3%. Production increased from 232.2 billion to 278 billion tonne-km, up almost 20%.\r\n The study also showed that the private sector has invested $US 13bn since 1997, when the first private concessions were awarded. In the same period, the federal government invested just $US 706m. Around $US 1.63 billion was invested in the network last year.