The Public Transport Authority in Perth is investigating the death of a 54-year-old disabled woman who was struck by an express passenger train today.
Police say the woman was trying to cross the tracks in her motorised wheelchair at the Carlisle train station with her 52-year-old carer.
It is believed her chair became stuck in the tracks and she was unable to escape the approaching train.
Sergeant George Tilbury says the carer did all she could to try to get the woman off the tracks.
"The carer made a frantic attempt to lift up the deceased person," he said.
"She's then tried to move her out the way but to no avail and for her own safety she had to jump out of the way."
The authority's David Hynes says the train driver is traumatised by the event.
"It's a terrible thing for the driver as well, no one wins in something like this. The driver has been offered counselling," he said.
"I don't know where he is or what he's doing right now. He's certainly been taken off duty and he'll certainly be looked after."