LONDON, ENGLAND - NOVEMBER 09: Members of London Fire Brigade look at the overturned tram at the site near Sandilands Tram stop in Croydon on November 9, 2016 in London, England. Five people are trapped after a tram derailed in a tunnel near Sandilands Tram stop in Croydon at 6.04am this morning. A further 50 people have been injured. (Photo by Carl Court/Getty Images)
Getty Images

Getty Images News Carl Court

LONDON, ENGLAND - NOVEMBER 09: Members of London Fire Brigade look at the overturned tram at the site near Sandilands Tram stop in Croydon on November 9, 2016 in London, England. Five people are trapped after a tram derailed in a tunnel near Sandilands Tram stop in Croydon at 6.04am this morning. A further 50 people have been injured. (Photo by Carl Court/Getty Images)
Getty Images

Getty Images News Carl Court

LONDON, ENGLAND - NOVEMBER 09: Members of London Fire Brigade close to the site near Sandilands Tram stop in Croydon on November 9, 2016 in London, England. Five people are trapped after a tram derailed in a tunnel near Sandilands Tram stop in Croydon at 6.04am this morning. A further 50 people have been injured. (Photo by Carl Court/Getty Images)
Getty Images

Getty Images News Carl Court

LONDON, ENGLAND - NOVEMBER 09: A paramedic walks the site near Sandilands Tram stop in Croydon on November 9, 2016 in London, England. Five people are trapped after a tram derailed in a tunnel near Sandilands Tram stop in Croydon at 6.04am this morning. A further 50 people have been injured. (Photo by Carl Court/Getty Images)
Getty Images

Getty Images News Carl Court