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Purvanchal Express is a weekly Express train of Indian Railways linking city of Kolkata with Gorakhpur via Siwan district of Bihar.

This is a long-distance express route and covers its journey within a day over 860 kilometers at a speed of 50 km/h. It has stops on stations such as:

• Kolkata
• Naihati
• Bandel
• Burdwan
• Durgapur
• Asansol
• Madhupur
• Jasidih
• Jhajha
• Barauni
• Samastipur
• Muzaffarpur
• Hajipur
• Chhapra
• Siwan
• Gorakhpur

The train shares its rake with 15049/50 Kolkata–Gorakhpur Express (via Ballia), 15051/52 Kolkata–Gorakhpur Express (via Narkatiaganj) and 15009/10 Gorakhpur - Mailani Gomti Nagar Express. The three pairs of trains are commonly known as Purvanchal Express via Ballia and Purvanchal Express via Narkatiaganj.

This train has the facility of AC 1 cum AC 2 tier, AC 2 tier, AC 3 tier, Sleeper Class, Second class sitting and General sitting type of coaches. All the classes except General class requires prior reservation. Tatkal scheme is available in this train, whereas pantry car facility is not available.It is hauled by Electric Loco Shed, Howrah electric loco shed based WAP-4 or Sealdah electric loco based WAP-7 from Kolkata to Gorakhpur

This train is very popular among the travelers as a result of this the people have to book their ticket in advance at least two months before and even in some cases the Tatkal tickets are also unavailable due to its high demand.

It is the most popular train connecting Howrah division with North Bihar and Northwest Uttar Pradesh.

• List of named passenger trains in India
• Sealdah–Ballia Express