Tokyo Metro suspended Hanzōmon Line train service between Shibuya and Kudanshita stations this week after asbestos-containing material was discovered at Hanzōmon Station [1].

The disruption affected one of Tokyo's primary transit arteries, forcing thousands of commuters to find alternative routes during the morning rush. Asbestos is a known health hazard, and the discovery required immediate containment and removal to ensure passenger safety.

Service was halted starting with the first train of the day [1]. Tokyo Metro said the suspension was necessary because asbestos-containing material was found at Hanzōmon Station and required professional treatment [1]. The operator said it aimed to resume service by the last train of the day [1].

One commuter expressed frustration over the length of the delay. "I found out this morning that it wasn't moving and wondered what to do, but I didn't think it would stay stopped until noon," the commuter said [1].

Conflicting reports emerged regarding the exact timing and cause of the disruptions. While Tokyo Metro focused on the asbestos removal, another report indicated a vehicle fault occurred at approximately 10:13 a.m. [2]. That report said service resumed at approximately 11:42 a.m. [2].

Tokyo Metro officials have not reconciled these differing accounts of the cause, but they said the discovery of hazardous materials at Hanzōmon Station was the primary driver for the initial suspension [1].

“Tokyo Metro suspended Hanzōmon Line train service between Shibuya and Kudanshita stations this week.”

The discovery of asbestos in an active metro station highlights the ongoing challenges of maintaining aging urban infrastructure. Because asbestos requires specialized removal protocols to prevent airborne fibers from contaminating public spaces, such discoveries often lead to total service shutdowns rather than partial delays. The contradiction in reports regarding a vehicle fault suggests a complex morning of operational failures, but the environmental hazard remained the critical safety priority for the operator.