# raildescriptionvalue This code list is used in association with the Description attribute which is present within the Rail Feature Type. The code list describes the type of land the rail feature is used for; this may be to change the direction of a train, to slow trains down, or the general area that trains traverse along. | Label | Definition | | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Railway Traverse | A structure within a railway marshalling yard used to switch carriages or engines from railway track to railway track using a perpendicular series of tracks. | | Made Surface | A surface that has been enhanced through application of either a loose material, such as gravel, or a solid bonded material, such as concrete. | | Sloping Masonry | A wall whose face is angled from the perpendicular. | | Transport Curtilage | The area of land attached as a boundary to a road or pavement. | | Turntable | A large flat metal area at ground level on which a train engine can be turned around or directed onto a different track. | --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.os.uk/osngd/code-lists/code-lists-overview/raildescriptionvalue.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.