Passengers held on to handrails after a door stayed open on a driverless Metro racing underneath Sydney, with a transport union later calling for the system to be shut down until safety measures were put in place. A “door fault” was identified on a train travelling between Chatswood and Crows Nest stations at about 8.01am on Wednesday, the Metro Trains Sydney chief executive, Daniel Williams, said in a statement. Two staff members – a so-called “customer journey coordinator” and a “customer operations lead” – were onboard the service at the time, Williams said. Attempts to remotely fix the door were