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- 2 foot by 4 foot S-MOD module, 2 mainlines at 2.75 inch spacing, and
siding at 3.25 inch spacing,
- 1x4 framing,
- Plywood top (with cross-braces underneath),
- With foam-board sub-roadbed to elevate roadbed above surrounding
"terrain", with matching wood section at each end to protect foam
sub-roadbed from damage.
- Homasote roadbed.  A matching wood section will be added at each end
to protect the Homasote from damage.

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