The entire Tung Chung line and Airport Express, as well as the stations added by the Tseung Kwan O line, has platform screen doors (PSDs), ordered from Swiss glass door manufacturer Kaba Gilgen AG, installed upon construction. So does the entire West Rail line (except Hung Hom station), inherited from KCR. These doors make platforms safer by preventing people from falling onto the rails, even though MTRCL did not heavily promote it directly. However, the primary motivation was to separate the stations from the tunnels, hence allowing substantial energy savings on station air-conditioning and tunnel ventilation. Automatic platform gates (APGs) have also been installed at the Sunny Bay and Disneyland Resort stations. Their heights are half of the PSDs and only prevent people from falling onto the rails. MTR has finished installing the APGs on all of the above-ground stations of the MTR except on the East Rail line; they will be installed there as part of the Sha Tin to Central Link project.