Hi,
in order to learn more MOI, I also tried the revolve command.
But it doesn´t work. My workflow seems to be wrong?!
I first marked the arc line (as profile curve), then the big line (rail curve) and set the revolve command.
Now MOI wants to select the revolve axis start point - I took the arc´s point not in the middle - took the other one (sry. for my bad english). And then the end point of the arc in the middle of the planed plane.

Hmmm....