Patna to Howrah via Kiul - Jasidih is 531 kms approx
Patna to Howrah vis Kiul - Jamalpur - Bhagalpur - Sahibganj - rampurhat is 507 kms approx
Patna to Howrah via Kiul...
more... - Jamalpur - Bhagalpur - Hansdiha - dumka - Rampurhat is 380 kms
Therefore, Patna Howrah Garib Rath can run via Bhagalpur - Sahibganj and Duranto can run via Bhagalpur - Dumka. Also, Patna Duranto can be extended from Buxar to cater more passengers.