Superintendent of Police R K Mishra said the man was arrested from Manjhaul Bazar locality following a tip off and a railway map and four mobile phones were seized from him.
The arrested man originally from Faizabad in Uttar Pradesh but was living in Cheriabariarpur police station area after marrying a local girl.
The ATS has joined interrogation of the man held in Begusarai, the SP said.
Recent arrest of three persons having links with ISI operative Shamsul Hoda brought to light the sabotage angle of train accidents including the one involving Indore Patna Express in November last year in which 150 passengers were killed.
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