Currently Dibrugarh to Guwahati has Many Routes as
1. Dibrugarh to Guwahati via New Tinsukia , Jorhat Town, Lumding, Chaparmukh is 603 Kms
2. Dibrugarh to Guwahati via New Tinsukia , Mariani, Lumding, Chaparmukh is 557 Kms
3. Dibrugarh to Guwahati via Sibsagar Town , Jorhat Town, Lumding, Chaparmukh is 552 Kms
4....
more... Dibrugarh to Guwahati via Sibsagar Town , Mariani, Lumding, Chaparmukh is 507 Kms
If the New Proposed Line Via CPK and Upper Kaziranga National Park is Connected with Jorhat to new Line to Sibsagar then the Route Will be Much Shorter and Will be More Faster than Other 4 Routes
Then Dibrugarh to Guwahati via Sibsagar Town , Jorhat Town, Khumtai, Salona, Nagaon, Chaparmukh will be 432 Kms More Shorter Route
Salona Khumtai = 100 Kms
Jorhat Sibsagar = 62 Kms
If Both Are Complete we can see more Trains in this Route Also