The deceased were identified as B Shravani (27), Amulya (11) and Jeevani (9), residents of Choppakatla Palem village in Bonakal mandal of Khammam district.
Railway police said the woman's husband had allegedly beaten her up fifteen days ago, and she had to be admitted to a hospital in Khammam.
She was discharged from the hospital yesterday, and presumably committed suicide alongwith the two girls early this morning. Railway employees later found their bodies on the tracks.