Signal boxes are essentially shelters constructed to house lever-frames and associated railway control equipment and to provide a degree of comfort for the human operators of that equipment. The lever-frames are used to operate points (more properly referred to as 'turnouts'), signals and level-crossing gates / barriers. For more information, please refer to the related article "What are railway signal boxes and why are they necessary?".
Signal boxes vary enormously in size, style and construction materials used, although many of the signal boxes within the SCRCA are timber-framed examples dating from the Midland Railway era (i.e. they were constructed during or before 1923).