the suggestion to extend to pune was to enable passengers upto satara and may be between satara and pune to some extent. Pune already has more competitive connections to banglore than what chennama would provide in an event it were extended. Its also a good idea to extend the train beyond banglore as well. So people of satara and surroundings will also benefit. I have read older blogs where it has often been pointed out that trains out of kolhapur fill up mainly at Miraj. So there is only limited potential from there by the looks of it. I hope IR looks into the suggestion