Hi,
Complicated things but l;ook in the archives section of this topic & you MUST follow what Dwight says, re changing it to show all (topics) it is likely to come up as 'last 30 days', and no topics otherwise!
Here is a active link http://archive.mylargescale.com/forum/forum.asp?FORUM_ID=13
Then there are 128 pages of articles and some will be about trestles - look for T J Lee for a start, there is lots of help there.
A basic size of the upright bents is (for 1/20th scale) 1/2" square, and lots of wood will be needed  Finally have a look for the Kalmbach book on 'Model Railroad Bridges & Trestles': it naturally mainly covers the smaller gauges but has a lot of information in it, including some plans of wood bridges and trestles, which can always be enlarged, for the main bents a jig also will be needed to ensure they are all the same. Garden Textures web site will possibly give you some ideas, they also sell plans as well as their kits. Happy building!
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