Actually HM165 and HM3601 are in the group of "Red + Grey", but KMB changed their chair to all red before they entered the service. You may discover this from their vin. number. HM165 and HM3601's vin. number are far away from the "All red" group but near the "Red + Grey" group. Also in Wikipedia, they list out HM165 and HM3601 are in the "Red + Grey" group, but changed to all red chair.