About suspension of operation of municipal subway blue line (return operation)

Due to a signal abnormality that occurred at 9:04 am on Saturday, October 28, the return operation was carried out between Odori Station and Azamino Station, but at 11:34 am the full line operation was resumed.
We apologize for any inconvenience this may have caused to you.

1 Overview

(1) Location of occurrence

Municipal Subway Blue Line Shonandai Station (drawal section: Shonandai Station-Odoriba Station)

(2) Progress

Saturday, October 28, 2023

9:04 a.m.

A signal device that detects trains at Shonandai Station mistakenly detected that there is another train on the departure path, causing an event that a train at Shonandai Station could not depart.

9:09 a.m.

Driving arrangements on all lines

9:25 a.m.

Maintenance staff is dispatched to the site for emergency response

The same

Started return operation between Odoriba Station and Azamino Station

10:26 a.m.

Maintenance staff arrived at the site

Investigate and identify the cause, and implement recovery measures

11:34 a.m.

Resuming full line operation

2 Impact

Number of affected personnel: approximately 12,000
9:9:25 (16 minutes)
Partial suspension (Shonandai Station-Odori Station) 9:25 to 11:34 (2 hours 9 minutes)

3 Causes

Due to dust containing iron powder adhered to the rail insulation, the signal device that detects the train incorrectly detected.