Do all Tokyo train platforms have screen doors?

Most major Tokyo lines now have full or half-height platform screen doors. The Yamanote Line completed full-height doors at all 30 stations by around 2024. Tokyo Metro's Marunouchi, Ginza, Hibiya, and Namboku Lines have most or all stations equipped. The Namboku Line was the first metro line in Japan with full PSDs at every stop, completed in 2000.

Why don't all major cities have platform doors?

Cost. Retrofitting platform screen doors requires either new rolling stock or precise alignment of existing trains within about 10 cm of the doors at every stop. The Yamanote Line retrofit took 20 years and required automatic train operation (ATO) software upgrades for older trains. Tokyo committed the capital expenditure across multiple decades; most cities have not.

Today I Learned

Tokyo, apparently, halved platform suicides by adding glass doors to its trains

Q: Did platform doors reduce suicide rates in Tokyo?

Yes. Studies by the Railway Technical Research Institute and JR East operational reports estimate that platform screen doors reduced suicide-related platform incidents on equipped platforms by approximately 80%, while also reducing accidental falls by a similar margin. The effect aligns with public-health research on means restriction: making a method harder to access reduces overall incidence rather than simply shifting it.

Platform screen doors on the Yamanote and Tokyo Metro lines reduced suicide-related platform incidents by roughly 80%. The retrofit took two decades, station by station.

Published 2026-04-28 · 2 min read · By Daichi

◇ Glass platform screen doors at a Yamanote Line station with a train pulling in behind them

A city’s quiet fix for a public-transit problem

The Yamanote Line — the green loop that ringfences central Tokyo — has 30 stations. As of 2026, all 30 have full-height platform screen doors: tall sliding glass barriers that only open when a train is fully stopped at the platform. Looking down the platform, it now resembles an airport terminal more than a 1960s subway.

The retrofit took twenty years to complete, station by station, almost no fanfare. The data on what it did is the part most people never see.

The fact

JR East and Tokyo Metro began installing platform screen doors (PSDs) in the early 2000s. Every line had a different rollout schedule based on rolling-stock door alignment and platform geometry — which is why some stations had doors years before others on the same line.

Studies published by the Railway Technical Research Institute and JR East operational reports have estimated that the platform doors reduced suicide-related incidents on PSD-equipped platforms by approximately 80%, while also reducing accidental falls (especially among elderly passengers and people who’d had a few drinks after work) by a similar margin. Tokyo Metro reported similar results across the Marunouchi, Ginza, and Hibiya lines.

Why it works this way

Two things stack:

Means restriction works. Public-health research consistently shows that making a method of suicide harder to access reduces overall incidence — it doesn’t simply shift to other methods at the same rate. The platform-door barrier is an example of this principle applied to public infrastructure.
Engineering tolerance. PSDs require trains whose doors align within roughly 10 cm of the platform doors every single stop. That’s not trivial. JR East had to retrofit older 205-series stock and use ATO (automatic train operation) on the Yamanote to maintain the alignment.

The door retrofit also did something subtler: it removed the visual access to the rails at most central stations. The track is now visually walled off behind glass, even when the train isn’t there. That, in itself, changes the platform’s psychological texture.

Where to see it

Yamanote Line — every station, full-height doors. Shinjuku has the busiest example.
Tokyo Metro Marunouchi & Ginza Lines — most stations done.
Tokyo Metro Namboku Line — was the first metro line in Japan with full PSDs at every stop, in 2000.

Closing

The platform door rollout is one of those Japanese infrastructure projects that quietly worked for two decades and then, when you finally read the numbers, makes you wonder why every major rail system on Earth doesn’t have them. Apparently the answer is simply: they’re expensive, and Tokyo decided to spend the money. That’s the whole story.