Re: blue foam sheets

The Stare wrote:
> I'm planning on building a N scale railroad on a sheet of 4x8 plywood. I

> keep reading about the blue foam sheets but don't understand the 
> advantages. Could someone enlighten me on the pros and cons of using the

> foam?
> 

-light weight
-easy to carve/sculpt/cut
-fairly rigid
-available in several thicknesses (I commonly see 1/2 up to 2 inch, and 
have occasionally seen 4 inch)
-fairly inexpensive