In the first incident, an 11th grader died by suicide in the Munnerpallam area of Tirunelveli on Tuesday morning.
The 16-year-old boy is studying in a support school in Palayamkottai.
He jumped in front of a speeding train and died on the spot.
Munneerpallam police retrieved the body and sent it to an autopsy.
Investigation revealed that he was addicted to mobile phones and caused friction at home with his parents.
In another incident, a female 11th grader in a public school in Sivakasi died by suicide on Tuesday.
The victim’s parents worked in the fireworks company. When the grandmother visited the girl’s house, she discovered the girl had hanged.
The neighbors brought the girl down, but she died. Maraneri police have registered a case.
The victim’s body was taken to Sivakasi Government Hospital for an autopsy.