The section from Saint John to the Maine-New Brunswick border was purchased by New Brunswick Southern Railway, a subsidiary of J.D. Irving Limited, an industrial conglomerate and major traffic source in Saint John. The section from the Maine-New Brunswick border west to Mattawamkeag (where it interchanges with Guilford Rail System) and on to Brownville Junction (where it interchanges with Bangor and Aroostook Railroad) was also sold to a JDI subsidiary, Eastern Maine Railway. West of Brownville to Montreal, the route was purchased by Iron Road Railways, the corporate owner of the Bangor and Aroostook Railroad.