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. 3 rajdhani trains run from New Bongaigaon to Katihar Jn - RAJDHANI EXP (12423), RAJDHANI EXP (20503) and RAJDHANI EXP (20505).

New Bongaigaon to Katihar Jn RAJDHANI EXP (12423) departs from New Bongaigaon station (NBQ) at 09:25 and arrives Katihar Jn station (KIR) at 16:20. This train has 5 stoppages. New Bongaigaon to Katihar Jn rajdhani fare is Rs.2170 in First AC, Rs.1330 in Second AC and Rs.995 in Third AC for this train which includes meal charges also.

New Bongaigaon to Katihar Jn RAJDHANI EXP (20503) departs from New Bongaigaon station (NBQ) at 08:20 and arrives Katihar Jn station (KIR) at 15:10. This train has 6 stoppages. New Bongaigaon to Katihar Jn rajdhani fare is Rs.2180 in First AC, Rs.1350 in Second AC and Rs.1015 in Third AC for this train which includes meal charges also.

New Bongaigaon to Katihar Jn RAJDHANI EXP (20505) departs from New Bongaigaon station (NBQ) at 08:20 and arrives Katihar Jn station (KIR) at 15:20. This train has 6 stoppages. New Bongaigaon to Katihar Jn rajdhani fare is Rs.2180 in First AC, Rs.1350 in Second AC and Rs.1015 in Third AC for this train which includes meal charges also.

Sampark Kranti is a series of express trains in India that connects different states of India to the national capital - New Delhi. Sampark in Hindi means connectivity while Kranti is also a word in Hindi language meaning revolution. Thus these trains have revolutionized the state connectivity with center. These trains have a combination of all the classes - AC, Sleeper and Unreserved coaches. Sampark Kranti trains are for long distance journeys. These trains are named after states and Sampark Kranti train for a particular state has most of the stoppages in that state only. 2 sampark-kranti trains run from New Bongaigaon to Katihar Jn - PORVOTR S KRNTI (14037) and PORVOTR S KRNTI (22449).

New Bongaigaon to Katihar Jn PORVOTR S KRNTI (14037) departs from New Bongaigaon station (NBQ) at 09:15 and arrives Katihar Jn station (KIR) at 17:15. This train has 2 stoppages. New Bongaigaon to Katihar Jn sampark-kranti fare is Rs.1705 in First AC, Rs.1020 in Second AC, Rs.720 in Third AC and Rs.265 in Sleeper for this train.

New Bongaigaon to Katihar Jn PORVOTR S KRNTI (22449) departs from New Bongaigaon station (NBQ) at 09:15 and arrives Katihar Jn station (KIR) at 17:15. This train has 3 stoppages. New Bongaigaon to Katihar Jn sampark-kranti fare is Rs.1785 in First AC, Rs.1065 in Second AC, Rs.765 in Third AC and Rs.295 in Sleeper for this train.