I was thinking about a trestle bridge for my layout ( Germany 1930 layout ) until I noticed that wooden bridges are very rare in Europe.
I purchased the book" N scale model railroading, getting started in the hobby )
and the author Marty McGuirk is using an N Scale timber trestle bridge from Blair line bridge Co. item # 67 timber trestle.
I hope this helps.
B.T. Eh