Gandy dancer is a slang term used for early railroad workers in the United States, more formally referred to as section hands, who laid and maintained railroad tracks in the years before the work was done by machines. The British equivalents of the term gandy dancer are navvy, originally builders of canals, or inland navigations, for builders of railway lines, and platelayer for workers employed to inspect and maintain the track. In the Southwestern United States and Mexico, Mexican and Mexican-American track workers were colloquially traqueros.

A railway track or railroad track, also known as a train track or permanent way, is the structure on a railway or railroad consisting of the rails, fasteners, railroad ties and ballast, plus the underlying subgrade. It enables trains to move by providing a dependable surface for their wheels to roll upon. 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.