A 40-year-old man died after being struck by a train at West Ealing railway station on Sunday afternoon.
The man from Ealing was killed as the 12.48 Heathrow Express train from Terminal Five to London Paddington travelled through the station.
British Transport Police are not treating the incident as suspicious and the lines were handed back to Network Rail at 2.04pm.
Station staff member Rasmikant Mehta was unaware someone had died when he arrived for work at about 5.30am on Monday.
He said: "There were stones from the track all over the platform in two places. I thought it was kids at first.
"Then I found two large,empty bottles of alcohol by a bench. The glass was a yellow brown colour but I don't know what the drink was."
Now concerns are being raised over the safety of West Ealing Station, which is closed on Sundays but the doors of which are left unlocked.
Eric Leach, of West Ealing Neighbours, said: "The doors to the station are open for anyone to walk in, and during days when the station is open there are generally no staff at the platform at all and trains fly past at very high speeds.
"We live in a world of conductorless buses and rail platforms bereft of staff.I'm not saying that if the station were locked then this would not have happened.
"But when trains go through at 80 or 90mph the platforms should be supervised, especially with all the talk of health and safety."
A British Transport Police spokeswoman said: "BTP can confirm that a 40-year-old man from Ealing died after he was struck by a train at West Ealing railway station.
"The incident occurred around 1.42pm on Sunday, October 12 and is not being treated as suspicious."