The Portland & Ogdensburg Railroad was chartered on February 11, 1867 to run from Portland to Fabyan, a junction at Carroll, New Hampshire in the White Mountains, where the Boston, Concord & Montreal Railroad would continue west. Their track joined in a ceremony at the summit of Crawford Notch on August 7, 1875, then opened on August 16, 1875. In 1864, the Essex County Railroad was chartered to run from St. Johnsbury, Vermont, on the Connecticut & Passumpsic Rivers Railroad, east to Lunenburgon the border with New Hampshire. The Montpelier & St. Johnsbury Railroad was chartered in 1866 to run west from St. Johnsbury to Montpelier. The Lamoille Valley Railroad was chartered in 1867 to run from West Danville on the planned M&SJ northwest to Swanton. The three companies were consolidated on August 7, 1875 to form the Vermont Division of the Portland & Ogdensburg Railroad, and the construction that had started was continued, except that the part of the M&SJ west of West Danville was never built. Construction on the Vermont Division began in 1871, and was complete in 1877. To connect between the two divisions, the company at first used trackage rights over the Boston, Concord and Montreal Railroad from Fabyan to Dalton, New Hampshire, but soon built its own alignment. West of Swanton, the P&O was allied with the Ogdensburgh & Lake Champlain Railroad, running west from Rouses Point, New York to Ogdensburg, and used the Vermont & Canada Railroad to access it. The Montreal, Portland & Boston Railway opened in 1876 from Montreal, Quebec to the national border, and was planned to continue into Vermont as a branch of the P&O. Just after completion of the Vermont Division the company went bankrupt, was taken over by the receiver on October 19, 1877. The Vermont Division was reorganized as the St. Johnsbury & Lake Champlain Railroad on January 31, 1880. On August 9, 1882 the Montreal, Portland & Boston Railway leased it, but it was soon taken over by the Boston & Lowell Railroad. , "the Big Cut", looking northwest c. 1880s The main division was reorganized on June 8, 1884 as the Portland & Ogdensburg Railway, and on August 20, 1888, the Maine Central Railroad leased it as their Mountain Division. In July 1912, the Maine Central Railroad leased the old Vermont Division, but on August 1, 1927 the lease was terminated, and a new lease was made on only the part east of St. Johnsbury. The remainder of the Vermont Division operated as the St. Johnsbury & Lake Champlain Railroad until reorganized as the St. Johnsbury & Lamoille County Railroad in 1948.
