1871 – Montreal and City of Ottawa Junction Railway Company was incorporated to build a line from Ottawa to Coteau Landing via Alexandria (Dominion Act 34, Vic. Cap 47, April 14, 1871).
1872 – Coteau and Province Line Railway and Bridge Company was incorporated to construct a rail line from Coteau through the counties of Beauharnois, Chateauguay, Huntington or Napierville to the US boundary (Dominion Act 35 Vic. Cap. 83, June 14, 1892).
1879 – The Montreal and City of Ottawa Junction Railway Company and the Coteau and Province Line Railway and Bridge Company were amalgamated under the name Canada Atlantic Railway Company (Dominion Act 42 Vic. Cap. 57, May 15, 1879).
1882 – February 1, the line from Coteau Junction to Casselman was completed and opened for traffic (48.50 miles)
1882 – September 13, the line from Casselman to Ottawa was completed and opened for traffic (29.76 miles).
1883 – July 1, the line between Coteau and Coteau Landing was completed and opened to traffic (2.00 miles).
1884 – July 1, the line between Lacolle to Clarks Island was completed and opened to traffic (43.50 miles).
1888 – The Ottawa, Arnprior and Renfrew Railway Company was incorporated to construct and operate a railway from Ottawa to Renfrew (Dominion Act 51 Vic. Cap. 71, March 23, 1888).
1888 – The Ottawa and Parry Sound Railway Company was incorporated co construct and operate a railway between Renfrew to Eganville (Dominion Act 51 Vic. Cap. 65, May 4, 1888).
1888 – July 1, the line between the International Boundary to Lacolle was completed and opened to traffic (7.25 miles).
1890 – February 1, the line between Clarks Island and Coteau was completed and opened to traffic (2.31 miles).
1891 – The Ottawa, Arnprior and Renfrew Railway Company and The Ottawa and Parry Sound Railway Company were amalgamated under the name The Ottawa, Arnprior and Parry Sound Railway Company (Dominion Act 54-55 Vic. Cap. 91, July 31, 1891).
1893 – May 14, the line between Ottawa deep Cut and Arnprior was completed and open to traffic (37.9 miles).
1893 – The Pembroke Southern Railway Company was incorporated to construct and operate a railway from Pembroke to Douglas. (Ontario Act 56 Vic. Cap. 96, May 27, 1893)
1893 – July 1, the line between Ottawa Riverside and Ottawa Main Street was completed and opened to traffic (0.82 miles).
1893 – July 1, the line between Scotia and Edgington was completed and opened to traffic (30.00 miles).
1894 – July 1, the line between Edgington and Rankin was completed and opened to traffic (10.00 miles).
1894 – September 16, the line between Arnprior and Renfrew Junction was completed and opened to traffic (17.35 miles).
1894 – September 16, the line between Renfrew Junction and Eganville was completed and opened to traffic (22.25 miles).
1894 – September 23, the line between Eganville and Madawaska was completed and opened to traffic (53.25 miles).
1895 – May 1, the line between Madawaska and Cache Lake was completed and opened to traffic (35.75 miles).
1895 – July 1, the line between Rankin and Rose Point was completed and opened to traffic (7.75 miles).
1896 – December 1, the line between Cache Lake and Scotia was completed and opened to traffic (46.04 miles).
1895 – December 1, the line between Rose Point and Depot Harbour was completed and opened to traffic (2.68 miles).
1897 – May 27, The Vermont and Province Railroad Company, a wholly owned subsidiary of the Canada Atlantic Railway was incorporated (by Cap. 167, State of Vermont) that ran from the international border to the Central Vermont Railway at Alburgh Junction (3.07 Miles) The line was constructed and opened in 1897.
1898 – The Canada Atlantic Transit Company, owned and operated by the Canada Atlantic Railway Company was incorporated (Dominion Act 61, Vic. Cap. 95, June 13, 1898).
1899 – Under deed of amalgamation, The Ottawa, Arnprior and Renfrew Railway Company and The Canada Atlantic Railway Company were amalgamated under the name Canada Atlantic Railway Company (Dominion Act 62-63 Vic. Cap. 81, August 11, 1899).
1899 – Under Agreement dated August 31, the Canada Atlantic Railway Company leased from the Pembroke Southern Railway Company the line between Golden Lake and Pembroke (21.09 miles) for a term of 5 years.
1899 – September 14, the Canada Atlantic Railway leased the Central Counties Railway line from Glen Robertson to Hawkesbury (21.00 miles) for a period of 99 years at an annual rent of $10,500 per year.
1899 – September 14, the Canada Atlantic Railway leased the Central Counties Railway line from South Indian (now Limoges) to Rockland (16.61 miles) for a period of 99 years at an annual rent of $8,500 per year.
1899 – October 30, The Canada Atlantic Transit Company of United States, owned and operated by the Canada Atlantic Railway Company was incorporated under the laws of Minnesota to operate a line of steamships between Duluth, Minnesota and Depot Harbor, Ontario.
1904 – Under agreement dated August 15 with J.R. Booth, the Grand Trunk Railway of Canada acquired control of the Canada Atlantic Railway (including the Canada Atlantic Transit Company, the Canada Atlantic Transit Company of US and the Vermont and Province Line Railroad Company).
1906 – The Canada Atlantic Railway Company (GTR) acquired all shares in the Pembroke Southern Railway Company.
1914 – The Canada Atlantic Railway Company is amalgamated with the Grand Trunk Railway Company of Canada taking the name of the latter company (Under Deed dated February 9, 1914 and ratified and confirmed by Dominion Cap 89, May 27, 1914). The agreement was ratified by the Grand Trunk Railway Company of Canada shareholders on April 2, 2014 and ratified by the The Canada Atlantic Railway Company shareholders on July 29, 1914, which under the terms of the agreement became the date of amalgamation.
1936 – The line from Limoges to Rockland (16.61 miles) was abandoned.
1942 – The operations of the Canada Atlantic Transit Company of United States was suspended with the liquidation of it’s assets.
1948 – The charter of the Canada Atlantic Transit Company of United States was allowed to lapse.
1950 – The charter of the Canada Atlantic Transit Company was allowed to lapse.
1956 – The corporate existence of the Pembroke Southern Railway Company came to an official end on June 11 when it was amalgamated with the Canadian National Railway.