Shatabdi Train should run from Varanasi via DDU - Patna - Jasidih - Asansol - Howrah.
Also Jan Satabdi Train should run from Danapur via Patliputra - Sonpur - Hajipur - Muzaffarpur - Samastipur - Khagaria - Katihar - Kishanganj - New Jalpaiguri. It can attract daily commuters as well as tourists who want to go Darjeeling & Other North-East Places.