A baby has tragically died and a woman is in hospital under police guard after the pair were struck by a train in Melbourne's outer east.
Homicide squad detectives are investigating the incident after the 3-month-old baby and the woman were hit by the train in Upwey on Sunday afternoon.
Emergency services were called to Kumbada Ave, which runs alongside the train line, about 5.10pm.
The baby was flown to hospital but died several hours later.