The Rajdhani Express is a series of express passenger train services in India operated by I ndian Railways connecting New Delhi with other important destinations (mostly capital cities of other states). The Rajdhanis are among the fastest trains in India along with Shatabdi Express and Duronto Express and get the highest priority on the Indian railway network.**
Duronto Express is a category of long-distance non stop trains run by the Indian Railways. These trains do not have any ticketing stops between the origin and the destination . "Duronto" means "restless" in Bengali language. These trains' coaches have characteristic yellow-green livery. Duronto Express services connect the several metros and major state capitals of India. These trains are faster than or as fast as Rajdhani and Shatabdi trains.**
The Garib Rath (literally: "Poor Man's Chariot") is a no-frills air-conditioned train started by the Indian Railways in 2005 to provide cheaper air-conditioned travel to passengers who could not afford normal fares of air conditioned class in normal trains. As the fares are less than two-thirds of the fares for air conditioned classes in other trains, the distance between each seat or berth is less, the seats and berths are narrower and each coach has more seats and berths than in air-conditioned coaches in other trains. Only seating and three-tier (78 seats) accommodation is provided in Garib Rath. The passengers are not provided free bedding or food.It is significantly slower than super-fast express trains. The maximum speed of Garib Rath trains is around 95Kmph.**
Mail/Express trains are Regular Express rail service of India. Express trains make small number of stops,
unlike Passenger/Local train. In some cases, trains run express where there is overlapping local train service available,
and run local at the tail ends of the line, where there is no supplemental local service. Because of their limited stops,
these trains are able to obtain the highest speeds of any trains in India.
An express train is one where the average speed, excluding halts, is greater than 36 km/h. Including halts speed may sometimes fall into the region of around 20 km/h, for express trains.**