The incident occurred at around 5:22 am when the woman (around 35-year-old) was crossing the tracks with her two daughters, aged 5 and 4, when the Mumbai-bound Devgiri Express knocked them down, the RPF Public Relation Officer for Central Railway C B D'mello said, adding the trio died on the spot.
The Kalyan Railway Police have registered a case of accidental death, he said, adding that the deceased are yet to be identified.