Photo/IllutrationA safety gate installed at Kanamecho Station on Tokyo Metro Co.'s Yurakucho Line (Asahi Shimbun file photo)

Tokyo Metro Co. is spending 60.2 billion yen ($547 million) to have safety gates installed on the platforms of its 179 subway stations by fiscal 2025 to prevent people from falling on the tracks.

Platform screen doors were set up at 82, or 46 percent, of the stations by April this year, according to Tokyo Metro officials.

The subway operator plans to introduce the safety features at an additional 50 or more stations before the 2020 Tokyo Olympics and Paralympics to increase the ratio to 77 percent.

It also intends to install the platform doors at all stations used by 100,000 or more passengers daily by fiscal 2024.

The 60.2 billion yen includes investments already made since April 2016.

For the Chiyoda Line, the screen doors will be introduced by fiscal 2019, a year earlier than initially planned.

Installation will be complete for the Ginza Line by the first half of fiscal 2018, for the Hibiya Line by fiscal 2022, for the Tozai Line by fiscal 2025, and for the Hanzomon Line by fiscal 2023.

Platform doors have already been set up at all stations of the Marunouchi, Yurakucho, Nanboku and Fukutoshin lines.