Santosh Upadhyay, 43, who boarded the Indore-Patna Express from Ujjain, says had it not been for a woman who requested him to exchange seats with her, he might have been in the S2 coach that was among the most severely damaged when the train ran off the tracks on Sunday morning. More than 140 people were killed and over 200 injured in one of the worst train accidents in the country in recent years.