A 30-year-old woman allegedly beheaded her one-year-old son and ended her life by jumping from a running train in Navi Mumbai's Vashi on Thursday night.

"A home guard in the ladies' coach saw the woman jumping from the running train with the bag in which the infant's beheaded body was found along the tracks on Vashi creek railway bridge on Thursday around 10.30  pm. The woman was returning from her maternal house in Hadapsar, Pune, from where she had left at 4.30 pm," said Vishnu Kesarkar, senior inspector, Vashi GRP.