The 22537 / 22538 Kushinagar Superfast Express is an Indian Railways train running between Lokmanya Tilak Terminus and Gorakhpur. It is numbered as 22538/22537. The train is named after the town of Kushinagar, an important Buddhist pilgrim centre near Gorakhpur.
The train takes nearly 30 hours to complete the distance of 1693 km. From Wikipedia
