The 12433 / 12434 Chennai Central – Hazrat Nizamuddin Rajdhani Express is an important train connecting Chennai & New Delhi. According to 1997-98 railway budget, pantry car service was introduced on 2633/2634 Hazrat Nizamuddin-Chennai Rajdhani Express in 1996-97 and maybe it was introduced then (1996–97). Thiruvananthapuram Rajdhani Express used to terminate at Madras (Chennai) Central and presently avoids Chennai and it is older than the current Chennai Rajdhani Express and this Thiruvananthapuram Rajdhani Express was first introduced in 1993 and runs twice a week from Delhi and twice from Chennai. The Chennai Rajdhani is a fast alternative to the classic Grand Trunk Express and the modern Superfast Tamil Nadu Express. The Chennai Rajdhani Express covers a distance of 2176 kilometers in 28 hours 10 minutes as compared to 33 hours and 5 min covered by Tamil Nadu Express and 35 hours and 15 minutes taken by Grand Trunk Express. It shares the record of being the second fastest train between Chennai Central and Hazrat Nizamuddin covering the distance of 2175 km in 28 hours and 10 minutes as Chennai Duronto covering the 2,175 km journey in 27 hours and 55 minutes but in return it does not happen.

The 12431 / 12432 Hazrat Nizamuddin–Thiruvananthapuram Rajdhani Express is a Rajdhani Express train service in India, connecting Hazrat Nizamuddin in the country capital New Delhi to Thiruvananthapuram Central, the capital of Kerala state. It is the longest-running Rajdhani Express train in India, which covers about 2845 km in about 42 hours.