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  2. Platform screen doors - Wikipedia

    en.wikipedia.org/wiki/Platform_screen_doors

    Half-height platform edge doors, also known as automatic platform gates, are cheaper to install than full-height platform screen doors, which require more metallic framework for support. Some railway operators may therefore prefer such an option to improve safety at railway platforms and, at the same time, keep costs low and non-air-conditioned ...

  3. Storm door - Wikipedia

    en.wikipedia.org/wiki/Storm_door

    A storm door is a type of door that is installed in front of an exterior access door to protect it from bad weather and allow ventilation. Storm doors generally have interchangeable glass panels and window screen panels to provide visibility and prevent flying insects from entering the home.

  4. Mass Rapid Transit (Singapore) - Wikipedia

    en.wikipedia.org/wiki/Mass_Rapid_Transit_(Singapore)

    The authorities initially rejected such calls by casting doubts over functionality and concerns about the high installation costs. [82] Nevertheless, the LTA reversed its decision and made plans to install half-height platform screen doors in all elevated stations on 25 January 2008.

  5. Technology of the New York City Subway - Wikipedia

    en.wikipedia.org/wiki/Technology_of_the_New_York...

    The cost would be around $31.7 million to install, plus $5 million in annual maintenance costs. [157] Since the clocks are based on the Transit Wireless Wi-Fi, installation of each set of displays would cost $211,000 at every aboveground station (which did not have Transit Wireless as of 2016 [update] ) and $54,000 at every underground station ...

  6. Door chain - Wikipedia

    en.wikipedia.org/wiki/Door_chain

    A door chain, security chain, or security door chain or chain door interviewer [1] consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door. [ 2 ]

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