Railway Tree

Railway track (UIC terminology) or railroad track (American English), also known as permanent way (per way), or "P way" (Indian English), is the structure on a railway or railroad consisting of the rails, fasteners, sleepers (railroad ties in American English) and ballast (or slab track), plus the underlying subgrade. It enables trains to move by providing a dependable, low-friction surface on which steel wheels can roll. Early tracks were constructed with wooden or cast-iron rails and wooden or stone sleepers. Since the 1870s, rails have almost universally been made from steel.