The 42-year-old driver was arrested on suspicion of manslaughter
A tram that crashed killing seven people and injuring more than 50 others has been removed from the scene in south London.
It was lifted off the tracks by a crane overnight.
Seven people died after the tram turned around a sharp bend and came off the track in Croydon during the morning rush hour on Wednesday.
More than 50 people were also injured.
The 42-year-old driver was arrested on suspicion of manslaughter and questioned amid suggestions the tram failed to brake as it took a corner at speed. He has been released on police bail until May.
Investigators said the tram was travelling at a "significantly higher speed than is permitted".
They are looking into whether the driver fell asleep and are set to publish an interim report into the crash next week.
Detectives are also examining a report that a tram "lifted onto one side" at 40mph in the same area on 31 October, in the week before the derailment.
British Transport Police said the claim "will now form one of our lines of inquiry".
Police said formally identifying the other victims dead may be a "complex and lengthy process".
The victims of the crash were remembered with a minute's silence following Armistice Day commemorations in Croydon on Thursday morning.
Croydon Council has set up an online crowdfunding campaign "to enable those directly affected by this tragedy ... to have access to ongoing care and support".