The Railways has identified six sections for high speed and semi-high speed rail corridors, Railway Board Chairman VK Yadav said on Wednesday, stating the detailed project report on three sections will be completed within a year. In a briefing ahead of the Union Budget, Yadav said the six corridors include the Delhi-Noida-Agra-Lucknow-Varanasi and the Delhi-Jaipur-Udaipur-Ahmedabad sections.