A track fence is a type of fencing that consists of a series of parallel rails, typically made of wood or metal, that are connected by vertical posts. The rails are usually spaced evenly apart and the posts are set in the ground to provide stability. Track fences are commonly used to contain livestock, as well as to provide a barrier between properties. The term 'track fence' can also refer to a type of fence that is used in horse racing, where the rails are placed along the track to keep horses from running off the course. The crossword solution for the term 'track fence' is 'RAIL', which refers to the parallel rails that make up the fence.