The 15233 / 15234 Maithili Express is Express type train of Indian Railways connecting Kolkata with Darbhanga. It covers a distance of 539 kilometers at an average speed of 49 kmph. It has general, AC two tier, AC three tier, and sleeper classes. All classes except general require reservations. There is no pantry car, although tatkal scheme is available. It is hauled by WAM-4, WAP-4 and WDM-3A classes of locomotives.
Both trains are hauled by a Howrah / Asansol-based WAP-4 locomotive from Kolkata to Barauni Junction, handing over to a Samastipur-based WDM-3A locomotive from Barauni Junction to Darbhanga, and vice versa.