Constable Chetan Kumar Choudhary fired from his automatic weapon, killing an RPF Assistant Sub-Inspector (ASI) and three other passengers of the Jaipur-Mumbai Central Express shortly after 5 am (Pic/Pradeep Dhivar)

The constable opened fire on his escort duty in-charge ASI Tika Ram Meena in the running train (Pic/Pradeep Dhivar)

After killing his senior, the constable went to another bogie and shot dead three passengers (Pic/Pradeep Dhivar)

The accused then tried to escape from the train between Mira Road and Dahisar, but was later nabbed by the Government Railway Police (GRP) personnel and his weapon was also seized (Pic/Satej Shinde)

The accused is in the custody of the Mira Road railway police. The bodies were taken out of the train at Borivali railway station (Pic/Satej Shinde)