Railway Freight Traffic of Canada map is contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows three condensed maps of Canadian railway traffic circa 1954. Net tons per mile of road operated are indicated. ‘Net tons per mile of road operated’ is to be understood as meaning that, in 1954, the total net freight passing any point on a given line was of the tonnage indicated by the flow line at that point. In a few areas on the maps, traffic carried by lines closely paralleling each other and providing duplicate service between the same points is indicated by one pair of flow lines only. The flow data is broken down to show flow direction (either east and south or west and north). Data for freight carried by Canadian railways in the United States of America were not available.