The woman Munni Devi was seen by eyewitnesses as throwing her two children Lalita Kumari (6) and Golu Kumar (3) before the speeding 55201 UP Narkatiaganj-Gorakhpur Passenger train near Balmiki Nagar railway crossing, police sources said.
The two siblings died on the spot.
The woman herself suffered injuries after tripping near the track, the sources said, adding the bodies had been sent for post-mortem and the injured woman admitted to a hospital.