Below is a picture of a completely assembled 2 foot strip of track with polyurethane. The ties are the original ones that I dipped and rubbed so they are a bit lighter than the ones that I have finished up a brush. I purposefully put the finished section on top of the unfinished curves to show how the polyurethane changes the color of the wood. It takes on a beautiful honey red color.
This was the last step in the prototyping in that I now have my method of assembly, method of stain, and have verified that the colors look good.