The Southern Ontario Railway (reporting mark SOR) is a shortline railroad in the province of Ontario. It operates 69 miles (111 km) of track from Brantford to Nanticoke, Ontario. The railroad began operations in 1998, and was acquired by RailAmerica two years later. It has interchanges with the Canadian National Railway at Hamilton via trackage rights, Brantford and Paris, and interchanges with the Canadian Pacific Railway at Hamilton.
The railroad's traffic comes mainly from steel, agricultural products, petroleum products, and chemicals. The SOR hauled around 44,000 carloads in 2008.
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