secondarycoupled

Secondary coupling, also known as secondary coupled or UIC coupling, is a type of coupling used to connect railcars together. It is a standard type of coupling used in many countries, especially in Europe and Asia.

The secondary coupling is used in conjunction with the primary coupling, which is typically a Buffon-UIC coupling. The secondary coupling is designed to be simpler and lighter than the primary coupling, and it is intended for use in situations where a higher degree of structural integrity is not required. Secondary couplings are often used to connect trains that are short enough to not require the greater strength of the primary coupling.

Secondary couplings are typically designed to meet the standards set by the International Union of Railways (UIC) and the Federal Railroad Administration (FRA). They consist of a metal frame with a ball-and-socket design, allowing the couplings to move freely and absorb shock loads. The secondary coupling is usually used for short-distance service, such as commuter rail or short-haul freight.

The design of the secondary coupling is often similar to the primary coupling, but with fewer steel elements and a lower level of safety certification. This is because the primary coupling is designed to withstand higher stress loads and is intended for more demanding applications. Despite this, secondary couplings are still subject to strict quality control and testing procedures to ensure their reliability and safety.

Overall, the secondary coupling is an important component of modern rail transportation systems, providing a safe and efficient means of connecting railcars together. Its use is widespread, particularly in regions where high-speed rail and freight traffic are prevalent.