The 22387 / 22388 Black Diamond Express is a daily superfast passenger train that connects the city of Dhanbad in Jharkhand to the capital of West Bengal, Kolkata.

[3] Due to the proximity of Dhanbad, the coal capital of India, to key coal and industrial regions in West Bengal (Asansol, Raniganj, Andal, Waria, Durgapur) and its closeness to Kolkata, a large number of passengers travel this route daily.

However, with population growth and industrial expansion, the sole superfast connection, the Howrah–Dhanbad Coalfield Express, couldn't meet rising demand.

The 22387 (HWH – DHN) departs Howrah at 06:15 and arrives in Dhanbad at 11:18, while the 22388 (DHN – HWH) departs Dhanbad at 16:20 and arrives in Howrah at 21:20, thereby traversing a distance of 271 km in around 5 hours, with an average speed of 54 km/h (34 mph) and maximum permissible speed of 110 km/h (68 mph).

The coach composition includes: The train will be converted into LHB rake, from DHN w.e.f 25.03.2025 and from HWH w.e.f 26.03.2025.