This document records the use of land owned by the Canadian National Railway for the purposes of constructing a dyke under the management of the East Coles Island Marsh Commissioners. While the CNR retained ownership of the land, upon payment of the rent of $1 the Marsh Commissioners were responsible for all aspects of dyke construction and all future liability. While this document represents a significant partnership between the Marsh Commissioners and the CNR as a landowner within the sewer district, the licence and its associated plan also indicate that the public road bed and rail bed played an important role as dykes themselves. Indeed, within a decade of this document, the rail bed was to become the effective dyke as formerly-dyked land to seaward was abandoned in a downturn of the marsh economy through the 1930s.