We used plaster cloth on our first display layout.  Other than 
weighing a ton, the plaster would crack every time we moved the layout. 
 Our current  layout uses foam for everything.  We used 2" blue builders 
foam for the board and WS risers and elevations for the subroadbed.  The 
embankments are made from "Great Stuff" canned foam insulation (triple 
expanding).  For the mountains we used the geodesic foam system.  Info 
on this can be found at:

http://www.bragdonent.com/index.htm

    We have written up the technique in using these in our Track 
Planning Guide.  At larger train showsI have seen rubber rock sections 
that look very nice.  I am not sure the companies name.  They are hot 
glued in place and are pre-weathered.  These really look good.
Don




 
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