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At the beginning?

All kidding aside, there are a lot of factors that go into building a trestle. How long? How high? Is it level or on a grade? Is it straight or on a curve? Some of the most basic questions. Best recommendation is to search this forum and the other large scale fourm Large Scael Central www.largescalecentral.com. Both locations have threads on building trestles. Doing some prototype research will also assist in understanding what goes into building a trestle.

You can also search the hobby press for drawings of trestles, there have been some over the years. My first hunt would be Narrow Gauge and Short Line Gazette. Model Railroader and Railroad Model Craftsman have also done some over the years. I know Model Railroader and NG&SLG both have/had DVDs available of back issues that would be a world of help.

Generally speaking, materials need to be along the lines of Redwood, Cedar, or pressure treated if building outdoors. Keep in mind we are building a RAILROAD in the outdoors, so we experience the same weather/time degradation the prototypes do, sometimes accelerated by the smaller scale.

Good luck and happy railroading!
 
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