I have a suggestion on adding ties. Measure your ties, then get weatherstripping that is closest to the
dimension, cut the weather stripping to length, stick it to your layout and set the track on top of it.
Another option, cut scraps of wood to the size of your ties, soak them in ordinary RIT dye for a day or two.
Then hot glue them to your track. Both these options are pretty cheap and look good, especially if
you ballast the track.