AC Express trains are fully air-conditioned Superfast Express trains linking major cities in India. They have high priority at intersections and are amongst the fastest trains in India. Although the top speed of 130 km/h is reached in some sections, on most sections trains are restricted to a speed of 110 km/h. AC Express train fares do not cover food, however the bedroll (pillow, pillow cover, blanket and bedsheet) is free for passengers who are traveling on this train. AC Express trains are often cheaper than those of the Rajdhani Express, Duronto Express and Humsafar Express (except Chennai–Thiruvananthapuram AC Superfast Express – with Rajdhani-type fare). Some AC Express trains have pantry cars.

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The first AC train, Nanda Devi AC Express ran on 1 July 2008, with a maximum speed of 125 kmph. Madurai-Bikaner Anuvrat AC Superfast Express is the longest-running AC Superfast Express of Indian Railways, covering total distance of around 3065 kilometres.

The following AC Express Trains have been operated:

1. Howrah - New Jalpaiguri AC Express