Half a track is a term used to describe a railway line that has been split into two separate sections. It is usually done when one section of the track is no longer in use, or when the track needs to be repaired or replaced. The term 'half a track' is derived from the word 'RAIL', which is a four-letter word that describes a type of transportation system consisting of two parallel steel rails. The rails are typically laid on a bed of gravel and ballast, and are used to support and guide trains along their route.