Passengers hold on as driverless Metro train speeds through Sydney tunnel with an open door

Rail union wants network temporarily shut down and an investigation into one of the worst safety incidents we've seen'

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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.