About suspension of operation of municipal subway blue line (turn-off operation)

Due to a traffic signal abnormality that occurred at 9:04 am on Saturday, October 28, a return operation was being carried out between Odoriba Station and Azamino Station today, but all line operation was resumed at 11:34 am Did.
We apologize for any inconvenience this may cause to you.

1 Overview

(1) Location of occurrence

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

(2) Progress

Saturday, October 28, 2023

9:04 a.m.

A signal device that detects trains at Shonandai Station incorrectly detected that there was another train on the departure path, resulting in an event in which trains at Shonandai Station could not depart.

9:09 a.m.

On all lines

9:25 a.m.

Maintenance staff are dispatched on-site for emergency response

Same

Turn back between Odoriba Station and Azamino Station

10:26 a.m.

Maintenance staff arrived on site

Investigate and identify the cause and implement recovery measures.

11:34 a.m.

Restart operation of all lines

2 Impact

Approx. 12,000 employees
From 9:09 to 9:25 (16 minutes)
Partial suspension (Shonandai Station-Odoriba Station) 9:25 to 11:34 (2 hours and 9 minutes)

3 Cause

Due to dust containing iron powder attached to the rail insulating part, a signal device that detects trains was incorrectly detected.