Rotterdam subway system completely shut down for hours

A fault in the railway security system brought the Rotterdam subway traffic to a standstill around 9:45 on Thursday morning. Transport company RET warned travelers to take extra travel time of "60 minutes or more" into account. The security system ensures that the subways are traveling at a safe speed and safe distances for each other, according to NRC. For the safety of the drivers and passengers, RED decided to stop all traffic on lines A to E. https://twitter.com/RETRotterdam/status/641903592329363456 Rail traffic was restarted again around 11:20 a.m. The delays are currently around 15 minutes. It is unclear how long the delays will last. https://twitter.com/RETRotterdam/status/641904367956836352