I'm still a little confused on tile placement, can I dead end a track into the a side on a tile (grass side) that is not matching track(assuming that at some point that meeting track will be converted to something valid)? Or do all track sides of the tile you are placing have to either meet up with no tile or a tile with a track on it facing my track? Also, can I redirect the last tile of a track I own, or is it only unowned track I can do this with, the rules confused me a little on this.