If you want to experiment with the 2 rail sweep way, it goes something like this - draw one smooth outline curve for the rails, then use Edit > Trim with the "Add trim points" option to cut it into 2 pieces:
Then to do a sweep along that, draw profile for the cross-section away from the rails, select the profile, run Construct > Sweep and then pick the rails to get a result like this (see 3DM file attached):
This method can be difficult though if the head part kind of tries to bend very sharply on one side...
- Michael
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