Sweep1 sweep2

Grasshopper
1

Hi all!
Immagine
how do I use sweep 1/2 commands and get closed surfaces with curves like in the photo?
Thanks :+1:

2

The rectangle should be your Rail ( R ), The arc should be your Section ( S ).

3

thanks Michael for answer
test-rh1
this is the result I would like
obtained with sweep1 sweep2 in Rhino

how do I get the same result in grasshopper?
ps obviously I use the curves selected as a section