PatternPilot,
I simply used Gorilla glue or Elmers glue to secure them to the roadbed I put down. It held great and was movable to get the spacing correct. I did not glue them to the track...no need to. I also disagree with your assessment about trimming the molding. It may be that the 3/4 " has been milled to get it close to the width of the metal ties. Again....I have done this and I think you will have a hard time telling which ties are from the pine molding and which ones are the track's metal. I will add a few more pictures to make my point. (The lengths may be a bit off, but I think it adds to the realism).
