model railway layout is a project i started 2 months ago from using plaster scene as a mold and pour plaster to make rocks, brick walls, mountains and cliffs. i also used foam and plaster. this project is not yet complete. ive also found a good way of cleaning the track. for the terain like grass and trees ive used products from Arizona Rock and Mineral Company so give them a go they make your layout go alive and look realistic.