Don't worry about being able to bend plywood into a vertical
curve. At one period on my last layout I had an operating
incline with a grade of over 25% with 1/2" plywood
subroadbed. I had to make sure the vertical curve at the top
and bottom was not too steep. That same layout had mainline
grades of about 3.5%, which were compensated on the curves.
No real problems with the vertical curves at the ends.
Note, this was a narrow gauge layout, so grades of 4% can be
considered prototypically correct. The incline grade was also in
the acceptable range.
Dave Heine
Easton, PA
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