Delhi Airport is not directly connected to the Indian rail network.
In order to take the train, the most suitable option is to transfer to the nearest train station which is New Delhi Railway Station. New Delhi is well connected to other parts of India using the rail system. You can book your tickets online and plan your trip well in advance.
The nearest train station to Delhi Airport is New Delhi Railway Station, which can be reached by taking the Delhi Metro Airport Express, a taxi, or a transfer.
Taking the train in India is one of the most popular transportation methods for both Indians and travelers. From New Delhi Railway Station, passengers will find all kinds of routes.