Trestle

Trestle (English: scaffolding ) or trestle bridge or viaduct pillar framework is a bridge design that consists of a structure with supporting elements short span, supported by upwardly tapering vertical elements and is usually at railway bridges in use. Timber frames were used in the 19th century mainly in mountainous landscape as well as Anrückwege at river crossings.

Trestle bridges have over their entire length, a frame-like substructure of prefabricated, standardized wooden or steel beams. On a railing or balustrade has been omitted in these bridges usually.

Trestle bridges are originally from the United States. Initially they were built entirely of wood. As a problem proved to be that it occasionally sparks were in the then usual steam locomotives, making the bridges could easily catch fire. With the conversion to diesel locomotives, this problem was solved though, but wooden bridges were often destroyed by arson. Therefore, finally won by the steel construction; a few wooden Trestles exist in America but still.

In Germany, here at public tracks usually performed as a steel construction, this design for example, found in the Saxon narrow gauge railways use. In Austria there are only at the Ybbstalbahn mountain route in Lower Austria and the Tyrol's Stubai Valley Railway.

As a precursor to the trestle bridge can be considered the most low Trestle.