New Delhi, March 25 -- Indian Railways has tightened its ticket cancellation rules across the board, doubling the no-refund window and extending percentage-based penalties to cancellations made earlier than before - a restructuring the government said was aimed at eliminating the financial incentive that allows touts to hold and offload tickets at inflated prices at the last moment. "This is to end the incentive for last-minute black marketing, where people are ready to pay any price," railway minister Ashwini Vaishnaw said.P7...