Kyunki agar rajgir ka sara passenger Patna jakar hi doosra train leta hai. Example agar kisi Rajgir ke passenger ko Gorakhpur Samastipur Motihari Darbhanga etc jana hoga to vo Patna jakar hi ya to doosra train lega ya bus lega.
Isiliye Rajgir se North Bihar ke liye ek train chala Deni chaahiye jisse Patna par depend na rahna pare