I would suggest that a new train from MAQ to MAQ via Hassan, Mysore, Bangalore, Salem, Coimbatore, Calicut, Kannur. Circular train to cover the distance in around 24 hours. 3 days clockwise and 3 days counterclockwise. Win win for all - passengers of Kerala, Karnataka and TN - Kerala get a train to Bangalore, Karnataka get a train in Mangalore to Bangalore route and TN get a train from Bangalore to Salem and Coimbatore. SR can operate from Mangalore as well as from Coimbatore. SWR can operate such a train from Bangalore.