Dover had two Chicago & North Western lines; a branch and a mainline.  
Today, the mainline is the Dakota, Minnesota & Eastern (Canadian Pacific), while the branch has been abandoned.  The branch was originally the Chicago Great Western.  
Bridges
 
 
Through Girder Bridge over S. Fork Whitewater River
DME Whitewater River Bridge #7
 
 
Through Girder Bridge over S. Fork Whitewater River
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