IR can boost Tourism in Bihar to invite Indian as well as Foreign Tourists (Especially from Japan) by linking Indian Entry Point Metro Cities with these Ancient Cities [Nalanda, Gaya and Sasaram] through various Superfast Train Services like:-
.
Howrah - Rajgir via Kiul - Nalanda
New Delhi - Rajgir via Patna - Kiul - Nalanda
Varanasi...
more... - Rajgir via Patna - Kiul - Nalanda
Varanasi - Rajgir via Sasaram - Kiul - Nalanda
Gaya - Rajgir via Kiul - Nalanda
Bombay (Mumbai LTT) - Rajgir via Jabalpur - Satna - Allahabad - Mughalsarai - Patna - Kiul - Nalanda
.
PS: Loco Reversals may be required for these trains but if IRI Members can suggest an alternative route to Nalanda without this reversal then comments are welcome.