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A Frames are the supports that carry the point rodding from the lever frame (Signal Box or Yard frame) to the points. These 7mm Scale A Frames are designed to use 1.0mm square Evergreen Poystyrene strip as the rods. A Frames appear to have been spaced every 7 feet (2135mm). The A Frames and rods were at varying distances from the track, refer to photos for guidance.