A 40-year-old woman has apparently killed herself after jumping in front of a train at Acton Mainline station.
There were dramatic scenes as the streets where cleared and an air ambulance landed outside the station.
The woman was on the tracks when she was struck by the 10.15 high speed service from Paddington to Cardiff.
Police are not treating the incident as suspicious - a second individual was believed to have been checked over by paramedics.
Services from London Paddington to Reading have been severally disrupted. First Great Western has advices commuters’ of delays of 30 minutes.
A British Transport Police (BTP) spokesperson said: "BTP officers were called to Acton rail station on Friday, 26 November after a report that a woman had been struck by a train.
"BTP and Metropolitan Police officers attended the incident, which was reported to police at 10.26am and is currently being treated as non-suspicious.
"Paramedics from the London Ambulance Service also attended but the woman, believed to be aged in her forties and from Acton, was pronounced dead at the scene. A file will be prepared for the coroner."
Click 'video' above to view the footage
Video courtesy of @hayesthompson