You can directly create the existing center line from rails without to convert cad lines to alignment. Just use "convert rails to center line". It will create the "regression line" you will be able to work with to create the geometry. However, in the current release (2018-U3) there is a bug and you will get a crash when trying to do regression on it. It has been fixed for the U4, but you need to workaround for now. The workaround is to do a report from the regression line as text file, import points from ASCII (there is the command in the Rail ribbon), sort the points to create a new regression line. Then you can do regression.
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