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This bridge is built to a particular design and truss configuration that was built throughout Ontario and of which a small collection of examples still remain today to represent the design and the characteristics which define the group. Although the design is found on multiple bridges in Ontario, outside of Ontario the design of these bridges would be classified as extremely unusual and rare. Two elements make the design unusual. First, the truss configuration is a subdivided double-intersection Warren. This means that in addition to a vertical member between each "X" of diagonal members, there is also a vertical member that passes right through the center of each "X." Double-intersection Warrens are uncommon, but subdivided double-intersection Warren truss bridges are very unusual. The other unusual feature of these bridges is the shallow slope of the end post, which results in an unusually long endpost. As a result of this unusually long end post design, there is an additional vertical and diagonal member that connect to the endpost halfway up, and there is also a floorbeam under the vertical member.
The Southdale Line Bridge stands out among the surviving examples of this design as noteworthy and visually unique because it is a very short example of the design, with only one "X" pattern of diagonals on the bridge. Elgin County, which happens to have a concentration of three of these bridges has another short example on Sutherland Line. The Southdale Line Bridge sits on concrete abutments. Although modern Armco guardrails have been added to the bridge, it also retains original pole railings. A vertical member that extends downward from the diagonal member intersection was replaced at some time.
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