Ivan Vegvary writes:
Making railings out of 2x6 stock, 122 in long. The center will be dadoed for the pickets. The flat faces will have slopes near the edges created by table saw.
Is there any way to slightly round off the corner where the sloping top face meets the remaining (about 3/4 in.) vertical edge. Other than sand paper.
Think homemade threshold where the slight top slope meets the edge.
Thank you!

Use a block plane, jack plane or fore plane.