A man was found lying injured on railway tracks in Southall on Monday.
Paramedics and transport police were seen running to tracks at Southall railway station when the incident took place between 6 and 7am.
One eyewitness, who did not want to be named said: "I was walking up towards the station at about 6.30am when I suddenly saw five or six police and a couple of paramedics running up the platform.
"I asked what was happening and they said that someone had been standing on the bridge and had either fallen down or jumped off. The man was lucky he wasn't killed."
A British Transport Police spokesman said: "Officers from BTP were called to Southall railway station around 6.40am on Monday after receiving a report of a man injured on the tracks.
"London Ambulance Service paramedics attended the scene and a 47-year-old man was taken to Ealing Hospital.
"His injuries are not life threatening and the incident is being treated as non-suspicious."
The railway line was handed back to Network Rail at 7am.
There have been other tragedies near the same spot in the past, including last year when Naryam Mohamed threw herself in front of the 9.20am Swindon to Paddington service. She was believed to be the victim of bullying at Greenford High School.
Navjeet Sidhu leapt to her death at the station with her children Simran, five, and Arran, two, in August 2005.
And in February 2006 Navjeet's mother Satwant Sodhi, 56, of Towsend Road in Southall, died after being hit by a high-speed train.
Her family said her life had become unbearable since her daughter had died.