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.
Beginning in 1962, the second main was phased out as Centralized Traffic Control (CTC) installation—completed in 1967 between Greensburg and Cincinnati—made extra capacity obsolete. A washout in the mid-1970s closed the line from Sunman, Indiana, to Greendale (the railroad's name for Thatcher), necessitating all through traffic to use alternate routes.