there are many people from nepal who are working in Kolakata, asansol and coal mines of dhanbad.
Now these peoples go to Gorakhpur, from gorakhpur they take bus to sunauli and cross to nepal.
why not ER start a SF train between Hwh to Nautanwa. Nautanwa is nearest railway station of Sunauli nepal border Via ASN-DHN-BSB-GKP.