A train trestle is a type of bridge that consists of a series of short spans supported by closely spaced rigid frames called trestles or bents. These frames are typically triangular in shape, resembling tripods formed by beams or posts joined together for structural support. The trestle supports the bridge's deck, which is the flat surface where the train tracks are laid. Trestle bridges were widely used in the 19th and early 20th centuries, particularly for railroad lines, to quickly span deep valleys, ravines, and other challenging terrain. They were often constructed from timber initially, with some later replaced by more durable materials like steel, iron, or concrete. While many timber trestles were intended as temporary structures until more permanent causeways or bridges were built, they played a crucial role in railroad expansion by enabling rapid bridge construction. Trestles are still used today in some areas for their ability to bear heavy loads and span large gaps efficiently. In essence, a train trestle is a bridge made up of multiple short, supported sections using tripod-like frames that hold the train tracks above the ground or obstacles below.
