 On 20 November 2016, X'Trapolis 100 trains were expanded to full-time running on the Frankston line and began operating services on the Werribee and Williamstown lines the same day.Although Melbourne's trains operate as either one or two 3-car units, it was not until September 2007 that the X'Trapolis 100s were permitted to operate as single-units in revenue service.The trains have power-operated doors that open when a button on the door is pressed and are closed by the driver or closed automatically after approximately two minutes.