CDA wagon

A CDA wagon, in the context of railway rolling stock, typically refers to a type of wagon specifically designed for the transport of clay, especially china clay. "CDA" often stands for "China Clay Driers Association," the original major user and specifier of these wagons in the United Kingdom. These wagons were built to a specific design to efficiently carry dried clay from the clay pits and drying plants to processing facilities or ports for export.

CDA wagons are usually easily identifiable by their distinctive appearance, often featuring a covered body to protect the clay from the elements during transit. The design minimizes the risk of contamination and ensures the clay arrives in optimal condition for its intended use. The covered nature also reduces dust emission during transport, which is an environmental consideration.

While the specific design and features may vary depending on the manufacturer and operator, CDA wagons generally prioritize capacity, weather protection, and ease of loading and unloading. They are an integral part of the china clay industry's logistics chain.