Kolkata Local - আমি তোমাকে ভালবাসি

If you can get BGP to arrive at 6am, then it will make a direct connection from Delhi to Dumka. (I wrote 6am because there is also some buffer time if it's a little late)
From Vikramshila, go down to Bhagalpur and sit in Kaviguru to go straight to Dumka.

The passenger who travels from Dumka, their rack comes from Devghar and goes back to the same place - Bhagalpur. If it can depart a little earlier and reach Bhagalpur by 11 o'clock, then there will be a connection for 12367 as well.