The incident occurred in the Coimbatore bound Nilgiris express that left Chennai last night.
Erode Railway police said the woman was the wife of Ashok Kumar, an IAF personnel working at Coimbatore.
They said she was provided a middle berth in the train.
Following the woman's request, Chandrasekar, special sub-inspector attached to the CB-CID police, Udhagamandalam, offered her his lower berth.
When the train crossed Salem in the early hours today, Chandrasekar in a drunken mood allegedly attempted to misbehave with her. But she raised an alarm and her husband came to her rescue and warned him.
As the train left the station, a railway police team rushed to Coimbatore by another train, traced and arrested Chandrasekar.
He was taken back to Erode and a case registered, they added.
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