A man has reportedly put up 4,000 posters in Kolkata, India, in desperate hope of finding a woman he fell in love with on a train.

Biswajit Poddar, 29, saw the woman sitting in a train with her parents.

Poddar claimed the woman behaved as if she was not interested in him at first but reckons his feelings were reciprocated after she smiled at him.

He even said that the woman mouthed her phone number to him when her parents were distracted yet he had no luck when trying to call the number.

In a final attempt to find his love interest, Poddar has resorted to placing 4,000 posters up.

Speaking to the Times of India, Poddar said he is wearing the same t-shirt every day that he wore when he saw the woman so she can identify him.

He said, "I am doing all this only so that she knows I am trying to find her and she can contact me if she wants.”