Ayyappan (31) was accused of singing obscene songs and passing lewd remarks on the girl students commuting to college, the police said.
The students, unable to bear with the harassment had complained to their college authorities, they said.
On Friday evening, Ayyappan allegedly indulged in misdemeanour and the girls got together, caught hold of Ayyappan and handed him over to the police.
On learning this, some employees of the transport corporation and trade unionists visited the police station where the conductor was taken to and asked the students to withdraw the complaint.
But the students insisted that the conductor be arrested. Following this, a case was registered by the police and Ayyappan was held after enquiry.