Trestle

A trestle (sometimes tressel) is a rigid frame used as a support, especially referring to a bridge composed of a number of short spans supported by such frames. In the context of trestle bridges, each supporting frame is generally referred to as a bent. Timber and iron trestles were extensively used in the 19th century, the former making up from 1 to 3% of the total length of the average railroad. In the 21st century, steel and sometimes concrete trestles are commonly used to bridge particularly deep valleys while timber trestles remain common in certain areas.

Many timber trestles were built in the 19th and early 20th centuries with the expectation that they would be temporary. Timber trestles were used to get the railroad to its destination. Once the railroad was running, it was used to transport the material to replace trestles with more permanent works, transporting and dumping fill around some trestles and transporting stone or steel to replace others with more permanent bridges.

In the later 20th century, tools such as the earthmover made it cheaper to construct a high fill directly instead of first constructing a trestle from which to dump the fill. Timber trestles remain common in some applications, most notably for bridge approaches crossing floodways, where earth fill would dangerously obstruct floodwater.

Read more about TrestleTimber Trestles, Iron Trestles, Steel Trestles, Concrete Trestles

Other articles related to "trestle":

Clio Trestle
... The Clio Trestle is a railroad trestle on the historic Feather River Route of the Union Pacific Railroad ... The trestle is 172 feet (52 m) high and 1,005 feet (306 m) long ...
List Of New Hampshire Historical Markers (201–225) - Markers 201 To 225 - 213. Frankenstein Trestle
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Parry Sound CPR Trestle
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trestles" class="article_title_2">Concrete Trestles
... The new Kate Shelley High Bridge in Iowa is a concrete trestle. ...
Arboretum Sewer Trestle
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