Metro Trains’ poor track maintenance led to the derailment of a train carrying more than 100 passengers, an investigation by the transport safety watchdog has found.

A passenger train on the South Morang line came off the rails near Rushall station on February 6, 2016, as the train reached the tightest bend on the network – the notorious ‘‘Rushall curve’’.

The derailed train. Credit:Luis Enrique Ascui

Passengers were escorted off the train by police and paramedics, with one person taken to hospital for treatment of their injuries.

In a report released on Wednesday, the Australian Transport Safety Bureau’s found the train came off the rails because the track was not adequately greased, creating friction between the wheel and the tight curve of the rail.