A how to for creating PBR / Parallax ground textures and converting your previous Trainz ground textures to take advantage of this new technology in Trainz Railroad Simulator 2019 or above. All this information is on the Trainz wiki if you need more knowledge of anything.
For example:
Trainz texture.txt
http://online.ts2009.com/mediaWiki/index.php/Texture_file
Trainz Groundtexture
http://online.ts2009.com/mediaWiki/index.php/KIND_Groundtexture
Trainz Materials
http://online.ts2009.com/mediaWiki/index.php/Material_Types
Turf Effects (part 1) – Getting Started