The 15909 / 15910 Avadh Assam Express is an Express train belonging to Indian Railways – Northeast Frontier Railway zone that runs between Dibrugarh railway station of Dibrugarh, Assam and Lalgarh Junction of Bikaner, Rajasthan in India. At present it currently holds the record for being the longest daily running train in India covering 3116 km in almost 65 hours 50 mins (~3 days). The train is often delayed due to its lengthy route.