They seemed common in Japan when I visited: https://alicegordenker.wordpress.com/2012/01/17/subway-safety-platform-doors-%E3%83%9B%E3%83%BC%E3%83%A0%E3%83%89%E

They seemed common in Japan when I visited: https://alicegordenker.wordpress.com/2012/01/17/subway-safety-platform-doors-%E3%83%9B%E3%83%BC%E3%83%A0%E3%83%89%E3%82%A2/ https://alicegordenker.wordpress.com/2012/01/17/subway-safet... (not my article)