Patrick Ward arrived in Bangkok on Boxing Day for a holiday in the South East Asian country but lost his life after taking a self portrait on a train, which he got on at River Kwai Station, after he allegedly opened the door to capture the photo despite warnings from attendants.
According to his fellow traveller Cheewarat Bee, the 45-year-old tourist was warned not to open the door as they hurtled past the scenic countryside.
The eyewitness told the Mirror newspaper: "He walked and passed me to the toilet and there was a tourist guide stood near the toilet who told him not to go out.
"She was the one who closed the train's door because her clients wanted to go out to take photos.
"Mr Ward went to the toilet and he opened the door and went outside, between the train bogies."
Cheewarat added: "He tried to take selfies and slipped from the stair."
After the incident, images appeared of a man matching Patrick’s description on a stretcher being rushed for treatment by medics. It was believed he might have fallen through while walking between the carriages, according to Thai authorities.
A Department of Foreign Affairs spokesperson said: "The Department of Foreign Affairs is aware of the case and stands ready to provide consular assistance."