There have been many, many articles in the model press, over many decades, on how to build wood trestles. Every one has been correct in simulating most of the prototype features of such construction. Modelers who wish to try a wood trestle should consult these articles, not just website photos or hubris-laden website wanderings, to avoid building what can only be described as vague caricatures of wood trestles. One can omit some of the detail in smaller scales, but the fundamental construction should appear correct. Flextrack on popsicle sticks isn't a tresle.