this train should never be extended upto patna via gaya because 1. if it will happen then there will be a need of changing the engine in dhanbad which is time consuming. 2 already in this train there is very long waiting list and ticket will not confirm easily 3. this is only train which connect kerala to jharkhand and also chennai to jharkhand and from patna there is already separate trains for both these states
so it is better to think about a new train inspite of thinking about the extension of this train