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[quote user="selector"]I could have worked harder to be more clear.[/quote] I should simply have read your first post. In your first post you state: You would never see a wooden span of 100' because the typically greatest length of timber in trestles and the like, the tallest bents, would be 30' Perhaps I misunderstand you again. If you mean that higher trestle bends are made of shorter posts of approximately 30' on top of each other you are right. That is possible as compressive forces can be transferred over a butt joint. <a href="http://www.highestbridges.com/wiki/images/2/2f/CedarRiverTrestle3.jpg">http://www.highestbridges.com/wiki/images/2/2f/CedarRiverTrestle3.jpg</a> The link shows the Cedar River Logging trestle in Washington State is 203' feet high. The story height differed from railroad to railroad. RGS had typically 16' with a maximun of 20'. GN Rwy bents were 27' to 33' high:  <a href="http://3.bp.blogspot.com/-IOtJjna4m-Q/UYkR6hkYZrI/AAAAAAAADmw/KPZv7IhhUjA/s1600/4.jpg">http://3.bp.blogspot.com/-IOtJjna4m-Q/UYkR6hkYZrI/AAAAAAAADmw/KPZv7IhhUjA/s1600/4.jpg</a> I think post length differed with availability of fitting timber. Regards, Volker<a href="http://3.bp.blogspot.com/-IOtJjna4m-Q/UYkR6hkYZrI/AAAAAAAADmw/KPZv7IhhUjA/s1600/4.jpg"> </a>
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