Hi SanSingh, for the one rail sweep you show above, I'd probably use Edit > Separate on your path curve to break it into 3 separate individual curves and then do 3 separate sweeps instead of trying to do it all in one single sweep.
If that doesn't do what you're looking for, please post the 3DM model file with your path and profile curves in it so I can take a look at your actual geometry instead of only a screenshot.
- Michael
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