Recovery teams are preparing to remove a 26-tonne concrete mixer which fell from a bridge in Oxshott on to a commuter train yesterday.
The vehicle smashed through a brick wall in Warren Road, and tumbled on to a passing Guildford to Waterloo train below about 3.30pm.
A South West Trains spokesman said the lorry hit the fifth and sixth carriages of the eight-coach train, which was carrying 40 commuters.
Five passengers were injured, including the 38-year-old lorry driver who had to be freed from the wreckage. His injuries are not life threatening.
A 60-year-old train passenger was taken to St George's Hospital in Tooting while others were treated at Epsom General Hospital and the Royal Surrey County Hospital.
Conservative MP for Esher and Walton, Dominic Raab, visited the scene of the incident and told the BBC: "We will have all the inquiries and forensics conducted in the days and hours ahead, both by the police and also by the rail accident investigation branch.
"But we will have to wait for the outcome as to why this happened and to make sure it doesn't happen again."
Train services are expected to be back to normal on Monday.
Were you on the train, or did you see the incident? Call the newsesk on 020 8330 9532.
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