Duronto Express, translating to "Speedster" in Bengali, is a class of long-distance rapid trains operated by Indian Railways. Initially conceived to operate non-stop between origin and destination stations, since January 2016, these trains have been permitted to make additional commercial stops and accept ticket bookings from technical halts. Before the introduction of trains like the Gatimaan Express and Vande Bharat Express, Duronto trains held the distinction of being the fastest trains in India. Unlike its counterpart, the Rajdhani Express, which links India's capital, Delhi, to state capitals, the Duronto Express connects major metropolitan areas, state capitals, and the national capital.

The Rajdhani Express is a series of passenger train services in India operated by Indian Railways connecting the national capital New Delhi with the capitals or the largest cities of various states. Rajdhani, derived from the Sanskrit means "capital". Introduced in 1969, the trains are amongst the premium services operated by Indian Railways and regularly get a higher priority on the railway network.