A 20 year old man from Aldershot is in hospital in Thailand with head and leg injuries after he fell out of a moving train.
Daniel Clarke was found lying by the train track in Thung-Kha, Chumphon province, on Saturday.
Days earlier he had posted a picture on Facebook, apparently hanging out of an open train door.
A spokesman for Thai Police said that Mr Clarke told police he stepped out to smoke between two carriages when he fell.
The Foreign Office said a Briton had been hospitalised in Thailand, and that they were supporting his family.
The Police spokesman said a friend of the backpacker told police it was an accident.
He's quoted as saying: "We don't believe there's a foul play going on because his belongings remained intact."