I've attached an image of my situation. It's a rail spur addition to an industrial site.
I'm using an alignment (the top long black line) and a corridor to model the rail and ditch, sloping to existing after the ditch. This works fine for the area between the green arrows.
In fact i can probably also easily model the other rail spur (shorter black line on bottom) and ditch with another corridor and alignment.
But how do I model a sort of storage area/ditch along the end of the rail spur, sort of a rounded endcap to the drainage area.
I know I can do this with features lines quite easily, but is there a good way to do it with corridors?