Jharkhand election will be announced in 1-2 weeks, so that's the main reason for inauguration from Koderma
MPs of Koderma and Hazaribagh demanded for this train.
If this train was from Gaya point of view, then it would have been via Ddu-Pcoi-Jbp.
Anyways seeing the lack of Mumbai bound train from Gaya, this will also be useful for Gaya.