A tram driver has been suspended after footage appeared to show him asleep at the controls on the same line as the Croydon crash that killed seven people.
An investigation was launched after a concerned passenger filmed the 32-second clip as the driver struggled to stay upright around three miles from the derailment in Croydon, south London, The Sun reported.
The footage was recorded between the Coombe Lane and Gravel Hill stations shortly after 6pm on April 21, the newspaper said.
A spokesman for rail company FirstGroup said: "The driver involved in the video has been removed from duty pending the outcome of the investigation.
"He will now be subject to a full investigation so it would not be appropriate to comment further at this stage."
Earlier, Crystal Palace and Manchester City fans fell silent before kick off at Selhurst Park as they paid tribute to the victims of the crash.
Two of the seven victims - named as 19-year-old Dane Chinnery and Philip Seary, 57 - were fans of the Eagles.
The others killed were Philip Logan, 52, Dorota Rynkiewicz, 35, and Robert Huxley, 63, all from New Addington, and Mark Smith, 35, and Donald Collett, 62, both from Croydon.
Investigators said the derailed tram was travelling at three-and-a-half times the speed limit when it crashed near Sandilands station on Wednesday morning last week.
The tram's driver, Alfred Dorris, 42, from Beckenham, south-east London, was arrested at the scene and questioned on suspicion of manslaughter before being bailed until May.