#270 2009 · East Japan Railway Company (JR East) · Public transitwrong-door
JR East lit its Yamanote Line platforms blue instead of building barriers, and suicide attempts there fell
the problem
Platform suicides kept rising, and screen doors were too costly to install everywhere
background
Japan records more rail-related suicides than any other country's transit system — close to 2,000 a year by some counts — and each one stops trains for hours and traumatizes staff and bystanders. The standard fix, platform screen doors sealing the track from riders, costs millions of dollars per station and takes years to retrofit across a network the size of Tokyo's.
JR East reached instead for a cue borrowed from prisons and psychiatric wards: blue light is associated with calm and reported to interrupt agitated states. After suicides on its lines rose from 42 in 2007 to 68, the company fitted blue LED fixtures above the far ends of platforms — the isolated spot, away from the crowd, where most attempts happen — across all 29 Yamanote Line stations in 2009, for a fraction of what physical barriers would have cost.
the move
After suicides on its lines rose from 42 in 2007 to 68, JR East fitted blue LED lights above the ends of platforms — the isolated spot where jumps cluster — across all 29 Yamanote Line stations in 2009, betting that a colour associated with calm would interrupt an impulsive act more cheaply than any physical barrier.
the payoff
A 2013 University of Tokyo study across 71 stations over a decade found an 84% drop in suicide attempts at stations with the lights (a wide 14–97% confidence interval, and a 2014 re-analysis argued the effect was overstated) — but the lights cost a fraction of platform screen doors, and the practice spread to other Japanese railways regardless.
what came after
The evidence stayed genuinely contested: the original 84% figure carried a confidence interval wide enough (14–97%) to draw a formal rebuttal in 2014 arguing the effect was overstated. JR East kept the lights anyway, and so did other Japanese railways — the cheapest plausible intervention won out over waiting for the expensive one to be funded.
filed under
references
- [1]PubMed — Does the installation of blue lights on train platforms prevent suicide?Journal of Affective Disorders (PubMed), 2013pubmed.ncbi.nlm.nih.gov
- [2]Psychology Today — Train Suicides Reduced by Blue LightingPsychology Today, 2025psychologytoday.com