Tokyo Metro suspended service on the Hanzomon Line on Tuesday after workers discovered materials containing asbestos at Hanzomon Station [1, 2].
The disruption affected a major transit artery in Tokyo, forcing thousands of commuters to find alternative routes during the morning and afternoon rush hours.
Operations were halted starting from the first train of the day between Shibuya Station and Kudanshita Station [1]. The suspension remained in effect for most of the day while crews worked to safely remove the hazardous material. Service finally resumed around 7:20 p.m. [2].
A Tokyo Metro spokesperson said the suspension was the result of the discovery and subsequent treatment of asbestos-containing materials at Hanzomon Station [1].
The sudden closure caused significant frustration for passengers who relied on the line for their daily commutes. One passenger said they knew the line was not running upon waking up, but did not expect the disruption to last until noon [1].
The company did not specify how the materials were discovered or the exact volume of asbestos removed. However, the duration of the closure indicates a comprehensive cleanup process was required to ensure passenger safety before reopening the tracks [1, 2].
“"Service finally resumed around 7:20 p.m."”
The discovery of asbestos in a high-traffic urban transit system highlights the ongoing challenges of maintaining aging infrastructure in Tokyo. Because asbestos is a known carcinogen, the decision to halt service for nearly 15 hours reflects a strict adherence to safety protocols over operational convenience, signaling that the operator prioritizes immediate hazard mitigation to avoid long-term public health liabilities.
