A preliminary ATSB report has found a Metro passenger train that derailed near Clifton Hill in July came off the tracks on a section that had undergone maintenance just days earlier, identifying flange climb as the likely cause. The fifth carriage derailed at 28km/h on a curve after leaving Rushall station, below the 40km/h speed limit. No injuries were reported among the 30 passengers, though services on the Mernda and Hurstbridge lines were disrupted for a week. Investigators say the full repo