They were protesting against alleged harassment of farmers by banks for non-repayment of farm loans and demanding among others waiver of all agricultural loans.
Vaiko and around 230 farmers and MDMK workers were arrested when they attempted to squat on the railway track at Kovilpatti as part of the state-wide protest by farmers' outfits, police said.
The agitation has been called by the Federation of Farmers Associations in the wake of suicide by farmers following alleged harassment by banks, which had lent to them, and pressing for waiver of such loans.
Meanwhile, a Coimbatore report said about 130 farmers, including the leaders of various farmers associations, were arrested while they were attempting to stage a rail roko in the city.
Led by C Thangaraj, president of Apolitical Farmers Association, the farmers gathered at the railway station to block a train. However, police arrested them.