The engine of Visakha Express, which plies between Bhubaneswar to Secunderabad, got detached from its coaches between Narsipatnam and Tuni railway stations on August 19. The train driver was unaware of this fact travelled at least 10 km without coaches. The official, however, could not explain the reasons for the uncoupling of the engine and the bogies when the train was on the move. Investigation is underway in this regard.