A trestle's a rigid frame used as a support, especially referring to a path supported by a number of such braced frames or short spans supported by splayed vertical elements (usually for railroad use). Timber trestles were extensively used in the nineteenth century in mountainous areas and to traverse floodplains adjacent to rivers as approaches to bridges. These were typically constructed using peeled logs preserved with creosote as vertical elements and with bolted and spiked sawn timbers fo… (More on Trestle)