The victim, Nitin Padalkar, ended his life by jumping before a running train at Kalyan railway station in the neighbouring Thane district on Friday evening, they said.
He has allegedly named two of his college-mates for harassing him in a suicide note, police said. Padalkar, a second-year student of electronics and telecommunications at the Ramrao Adik Institute of Technology in Navi Mumbai, was depressed for quite sometime, police sources said.
Nitin left his house in Kalyan at around 6 pm on Friday saying that he was going to meet his friends. Later, his family got the news of his death at around 8.50 pm from the police.
Based on the preliminary enquiry and the circumstances of the death, it is suspected that "Padalkar was a victim of ragging", police sources said.
"We will question two of his college-mates on Monday," sources at Government Railway Police, Kalyan said.