The second main was removed beginning in 1962, as Centralized Traffic Control (CTC) installation—completed between Greensburg and Cincinnati, in 1967, made the extra capacity redundant. A washout in the mid-1970s closed the line between Sunman, Indiana, and Thatcher (the railroad's name for Greendale), Indiana, forcing all through traffic onto alternate routes.
In 1962, the second main was removed due to Centralized Traffic Control (CTC) installation—completed in 1967 between Greensburg and Cincinnati—which rendered extra capacity unnecessary. A washout during the mid-1970s closed the line from Sunman, Indiana, to Greendale (the railroad's name for Thatcher), forcing all through traffic onto alternative routes.