Rajdhani express are premium category trains by the Indian Railways that redefines luxury travelling in India. It is a fully air-conditioned train which connects country capital (Delhi) with state capitals. That is why they are called 'Rajdhani' which translates to 'Capital' in English. These train runs at very high speed and therefore it usually takes least time to reach destination compared to other trains on the same route. Mumbai rajdhani is the fastest rajdhani train which attains a maximum speed of 140 kmph on some stretch. Rajdhani Express offers catering facilities inside the train the fare of which is included in ticket fare. Rajdhani trains have 3 classes - First AC (1A), AC II-tier (2A) and AC III-tier (3A) only and they are coupled with LHB coaches that have higher safety features. The ticket fare for Rajdhani is maximum amongst all trains on the same route and has dynamic fare (Flexi Fare) system. Waitlisted passengers are strictly not allowed inside this train. Rajdhani train coaches are usually painted in red with a grey colored strip outside. 2 rajdhani trains run from Kokrajhar to Guwahati - New Delhi Dibrugarh Rajdhani Express (via New Tinsukia) (12424) and DBRG RAJDHANI (20504).

Kokrajhar to Guwahati New Delhi Dibrugarh Rajdhani Express (via New Tinsukia) (12424) departs from Kokrajhar station (KOJ) at 15:35 and arrives Guwahati station (GHY) at 19:15. This train has 10 stoppages. Kokrajhar to Guwahati rajdhani fare is Rs.1460 in First AC, Rs.895 in Second AC and Rs.670 in Third AC for this train which includes meal charges also.

Kokrajhar to Guwahati DBRG RAJDHANI (20504) departs from Kokrajhar station (KOJ) at 14:50 and arrives Guwahati station (GHY) at 18:25. This train has 8 stoppages. Kokrajhar to Guwahati rajdhani fare is Rs.1380 in First AC, Rs.850 in Second AC and Rs.620 in Third AC for this train which includes meal charges also.

The concept of Garib Rath started with the vision to provide air conditioned berths at a comparatively low price for the people who could not afford to travel in AC coaches. Garib-rath phrase translates to poor man's chariot in English. The fare in this train is almost two-thirds of regular third ac fare. Usually Garib Rath have Third AC (3A) class only excepting some 1-2 trains which also have Chair Car (CC) class. The compartments of these train coaches have 9 berths making an extra space for side middle berth which is not there in any other train in India. In case passengers want to have bedrolls they need to pay separately for it. Some garib-raths run as fast as rajdhani, but they have lesser priority for track clearance compared to them. These trains are painted green with a yellow colored strip along the window panes. 2 garib-rath trains run from Kokrajhar to Guwahati - GHY GARIB RATH (12517) and AGTL GARIB RATH (12501).

Kokrajhar to Guwahati GHY GARIB RATH (12517) departs from Kokrajhar station (KOJ) at 11:20 and arrives Guwahati station (GHY) at 15:55. This train has 3 stoppages. Kokrajhar to Guwahati garib-rath fare is Rs.395 in Third AC for this train.

Kokrajhar to Guwahati AGTL GARIB RATH (12501) departs from Kokrajhar station (KOJ) at 11:20 and arrives Guwahati station (GHY) at 15:45. This train has 9 stoppages. Kokrajhar to Guwahati garib-rath fare is Rs.395 in Third AC for this train.