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. The new structure of cancellations penalties was announced by Union railway minister Ashwini Vaishnaw on Tuesday. The most significant change is the no-refund window, which doubles from four hours before departure to eight. Under the existing rules gazetted in 2015, an unsold tickets could be cancelled within four hours of departure with 50% of the fare forfeite...