In the past four years, a total of 52 BSE PSU index stocks multiplied their market capitalisation by nearly 5 times. Rail Vikas Nigam Ltd, Hindustan Aeronautics Ltd, Cochin Shipyard Ltd, Hindustan Copper Ltd, Indian Bank, Bharat Dynamics Ltd, Bharat Electronics Ltd and Housing & Urban Development Corporation Ltd delivered 1,000-2,150 per cent returns in the four-year period. In the …