The 12577 / 12578 Bagmati Superfast Express is a weekly Superfast Express train from Darbhanga in Bihar to Mysore in Karnataka, a 3036 km long route and it is operated by Indian Railways–East Central Railway zone.

It is the only direct train from Mysuru in Karnataka and darbhanga in Bihar This train is named after the Bagmati River which originates in Nepal and flows through Darbhanga.

[1] Bagmati Express is one of the most important train for the passengers of Bihar.

Inaugural Run was Fri 23 Feb 2007 from Darbhanga Junction.

It is hauled by a Gomoh Loco Shed or Samastipur Loco Shed-based WAP-7 electric locomotive from Darbhanga to Mysuru and vice versa.