HALIFAX — A $30,000 monthly subsidy intended to preserve a disused Cape Breton rail line will not be renewed, Nova Scotia’s economic development minister said Thursday. Susan Corkum-Greek said the decision was made after CN Rail last fall acquired a stake in the line that runs across the island from St. Peter’s Junction to Sydney, N.S. She said she concluded there were no imminent private-sector plans to develop the line, which has fallen into disrepair. “It was in my view time to call it,” the