Cant join surfaces after sweeping

2 simple surfaces and cant be joined after sweep2, how to solve it?
prob123.3dm (95.3 KB)

Hello - yeah it does look like it ought to join there - I’ll put this in the developers pile for a look, thanks. That said though, a Loft between the two rail curves looks like the simpler way to get this surface.
Actually on a closer look, your line does not touch both rails at the top -

clean that up and it ought to work.


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