In 1960, the Railway Board of India commissioned a study to increase the speed of its trains, which was restricted to 96 km/h (60 mph) on the existent broad gauge lines.

Research Design and Standards Organisation (RDSO) started work on the same in 1962 with field trials commencing in 1967.

[1] On 19 February 1969, the Government of India introduced a new express train capable of reaching speeds of up to 120 km/h (75 mph) as announced in the railway budget.

[10][11] These coaches are equipped with newer air suspensions, bio-toilets, Wi-Fi, fire alarms, CCTVs, reading lights, dedicated power sockets, automatic doors, passenger information system, improved interior and designed exterior.

[13] Indian Railways plans to introduce Tejas coaches across all Rajdhani trains in a phased manner.