In accordance with an Indian Ministry of Railways decision, Indian Railways switched from its previous four-digit numbering system for passenger trains to a five-digit system on December 20, 2010.

India has a system of express trains, operated by Indian Railways which comes under the purview of the Ministry of Railways of Government of India. As of 2023, it maintains over 108,706 km (67,547 mi) of tracks and operates nearly 3,000 express trains daily. According to the Ministry of Railways, express trains travel faster and have limited stops than ordinary passenger trains. Any passenger train with an average speed higher than 55 km/h (34 mph) is considered super-fast.