The term 'TRACK SECTION' can be solved by the word 'RAIL', which is a four-letter word. A track section is a section of railway track, which is a structure consisting of two parallel steel rails, typically anchored perpendicular to beams, known as sleepers, which are laid on the ground to support the rails and allow trains to move by providing a dependable surface for their wheels to roll upon. Track sections are usually laid in a straight line, but can also be curved or even looped.