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The Melbourne and Hobson's Bay Railway Company was a railway company in Victoria, Australia. The company was incorporated on 20 January 1853 to build the line from Melbourne to the port of Sandridge, now Port Melbourne. The line was constructed to 1600 mm (5 ft 3 in) "broad gauge" in keeping with an agreement between the three then extant colonies to adopt that gauge – subsequently abandoned by the government of New South Wales.