Upgrading to the fast lane is set to cost the Indian Railways a pretty penny. After Railway Minister Suresh Prabhu announced in the Railway Budget this year his plans to upgrade several trains to semi high-speed pace under ‘Mission Raftar,’ the Western Railways has submitted their estimate of turning the Mumbai-Delhi corridor, which sits at a cosy Rs 10,000 crore for upgrading the Rajdhani and August Kranti Express to 160 kmph from their current 130 kmph.