A London Tramlink service derailed last year, with fatal results.
Rail crash investigators released a video reconstruction on Thursday.
It showed the tram leaving the tracks at 78 km/h in a 20 km/h zone.
Investigators said driver Alfred Dorris may have been in a "microsleep" at the time.
Dorris is being investigated by police over a potential manslaughter case.
Rail accident investigators have released a video showing exactly how a "catastrophic" tram crash unfolded last year, killing seven people.
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