Booth then began a massive railway expansion program, both to supply the mills from areas not on the River, as well as to send the products from the Ottawa mill to markets not easily served via the St. Lawrence. This program started with Booth's purchase of Macdonald's Montreal and City of Ottawa Junction Railway (M&O) from Ottawa to Coteau Junction, where it met the Grand Trunk Railway lines just west of Montreal, as well as the Coteau and Province Line Railway and Bridge Company which linked the M&O to the Central Vermont Railway just across the St. Lawrence. Construction began in 1881 and finally crossed the St. Lawrence in 1890.