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 Kolkata to Delhi - RAJDHANI EXPRES (12301), RAJDHANI EXPRES (12305) and RAJDHANI EXPRES (12313).

Kolkata to Delhi RAJDHANI EXPRES (12301) departs from Howrah Jn station (HWH) at 16:50 and arrives New Delhi station (NDLS) at 10:05. This train has 8 stoppages. Kolkata to Delhi rajdhani fare is Rs.4940 in First AC, Rs.2970 in Second AC and Rs.2155 in Third AC for this train which includes meal charges also.

Kolkata to Delhi RAJDHANI EXPRES (12305) departs from Howrah Jn station (HWH) at 14:05 and arrives New Delhi station (NDLS) at 10:05. This train has 8 stoppages. Kolkata to Delhi rajdhani fare is Rs.5090 in First AC, Rs.3055 in Second AC and Rs.2225 in Third AC for this train which includes meal charges also. Active on IRCTC

Kolkata to Delhi RAJDHANI EXPRES (12313) departs from Kolkata Sealdah station (SDAH) at 16:50 and arrives New Delhi station (NDLS) at 10:50. Kolkata to Delhi rajdhani fare is Rs.4940 in First AC, Rs.2970 in Second AC and Rs.2155 in Third AC for this train which includes meal charges also.

Duronto express is a newer premium class of train which runs as fast as Rajdhanis. Duronto word comes from restless in Bengali as these trains had no intermediate commercial stops when they started. But since Indian Railways incurred losses for these trains, some technical stops were converted to commercial stops. On some routes (such as Delhi-Kolkata) they take lesser time than corresponding Rajdhani express. Unlike rajdhani some durontos also have non-air conditioned sleeper class. Thus, Duronto trains have classes First AC (1A), AC II-tier, AC III-tier and Sleeper. Bed-rolls in sleeper class of Mixed Duronto Express trains will be supplied to passengers on demand, on payment of stipulated charges. Duronto trains are distinguished by vibrant and colorful vinyl coating on the outer surface of the coaches. 2 duronto trains run from Kolkata to Delhi - NDLS DURONTO EX (12273) and BKN DURONTO EXP (12259).

Kolkata to Delhi NDLS DURONTO EX (12273) departs from Howrah Jn station (HWH) at 08:45 and arrives New Delhi station (NDLS) at 06:40. This train has 6 stoppages. Kolkata to Delhi duronto fare is Rs.5215 in First AC, Rs.3165 in Second AC, Rs.2335 in Third AC, Rs.1835 in Third Economy and Rs.945 in Sleeper for this train which includes meal charges also.

Kolkata to Delhi BKN DURONTO EXP (12259) departs from Kolkata Sealdah station (SDAH) at 17:00 and arrives New Delhi station (NDLS) at 11:00. Kolkata to Delhi duronto fare is Rs.4895 in First AC, Rs.2925 in Second AC and Rs.2110 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. 1 sampark-kranti train runs from Kolkata to Delhi - SAMPARK K EXP (12329).

Kolkata to Delhi SAMPARK K EXP (12329) departs from Kolkata Sealdah station (SDAH) at 13:10 and arrives Anand Vihar Trm station (ANVT) at 08:50. Kolkata to Delhi sampark-kranti fare is Rs.4045 in First AC, Rs.2385 in Second AC, Rs.1665 in Third AC and Rs.635 in Sleeper for this train.