Markem writes:
On Fri, 28 Apr 2017 08:11:58 -0700 (PDT), Ivan Vegvary
wrote:

Markem, use a roundover bit riding on what surface?
Using a plane soumds easiest. Did not think of that.

The 3/4 " left???

Plane and sanding vs router probably about the same amount time
invested.

I think you haven't visualized the problem sufficiently. A router
cannot acomplish Ivan's task.

A _______ B
/ \
/ \
| |
| |
-------------

End-on view of rail.

Ivan wishes to soften the corners A & B. Note that the slope
will be much shallower than the ASCII graphics above.