There could be interruptions to train services and a delay of the Sydney Metro rollout as industrial action from the Rail, Tram and Bus Union (RTBU) begins on Wednesday. There could be interruptions to train services and a delay of the Sydney Metro rollout as industrial action from the Rail, Tram and Bus Union (RTBU) begins on Wednesday. Rail Transport Industry, State and Territory Government, Unions, Government and Politics, State and Territory Parliament, Transport Industry, Public Sector Latest business news