The First set of Rajdhani Express was Inaugurated on 26 October 1996 as Guwahati Rajdhani Express which runs through Barauni, was Flagged off by Ram Vilas Paswan which runs as a Weekly service. Later that the Frequency was Increased to Tri-weekly in 1997.
Later on, 11 January 1999 the Second set of Guwahati Rajdhani Express was Inaugurated which runs through Chhapra, was Flagged off by Nitish Kumar which runs as a bi-weekly service.
After that on, 24 March 2010 the Third set of Guwahati Rajdhani Express was Inaugurated which runs through Muzaffarpur, was Flagged off by Mamata Banerjee which runs as a weekly service.
Later due to public demand in 2012, The three sets of Rajdhani was extended up to Dibrugarh and runs as Dibrugarh Rajdhani Express and also the Frequency of First Set increased to daily service.
Route & Halts
Train number 12423/24 goes via, New Tinsukia, Mariani, Dimapur, Guwahati, New Jalpaiguri, Katihar, Barauni, Patliputra, Pt. Deendayal Upadhyay Jn., Kanpur Central to New Delhi.
Train number 20503/04 goes via, Mariani, Dimapur, Guwahati, New Jalpaiguri, Katihar, Samastipur, Muzaffarpur, Hajipur, Chhapra, Varanasi, Lucknow Charbagh, Moradabad to New Delhi.
Train number 20505/06 goes via, Dhemaji, North Lakhimpur, Harmuti Jn, Viswanath Chariali, Rangapara North Jn, New Missamari, Rangiya Jn,New Bongaigaon Jn,Kokrajhar, New Alipurduar,New Jalpaiguri Jn,Katihar Jn,Barauni JnHajipur, Chhapra, Varanasi, Lucknow Charbagh, Moradabad to New Delhi.
1st set of train number 12423/24 hauls by a Siliguri based WDP 4/WDP 4B/WDP-4D locomotive from DBRG to KIR and then handing over to a Ghaziabad based WAP 7 locomotive from KIR to NDLS and vice versa.
2nd & 3rd set of train number 20503/04 & 20505/06 hauls by a Tughlakabad diesel loco shed based WDP 4B / WDP-4D locomotive on its entire journey.
Derailment
On 25 June 2014, this train derailed in Chhapra, Bihar, killing four people and seriously injuring eight. Sabotage by Naxalites was considered but ruled out as the cause of the crash. Also, on 6 December 2016 derailed in Allipurduar district of west Bengal.
