Hi,
some explanations (i'm french, forgive me for my poor english)
the basic shape. I use Max' tools (split, bridge, scale)
subdiv script
boolean substract with red curve
i join top edges to make a curve. I copy it and move the copy.
too many points. So i use Rebuild command
rail sweep (blue rails)
the result
iso curve (yellow). i reshape it....
... and make new rail sweep (two red profiles and two blue rails)
the basic shape (.3dm) is in attachement.
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