Train passengers were left "distressed" and "confused" when the driver of a packed train encouraged them to get off at a station for some fresh air – only to leave without them.
Trevor Greenfield, 74, and his wife, Eileen, 68, were among the group of eight passengers stranded at Swindon, having boarded the train from London Paddington to Carmarthen.
"People were distressed, confused and flabbergasted," said Mr Greenfield, from Barry in Vale of Glamorgan. "It's worrying and disappointing that the driver made no announcement that the train was leaving."
Great Western Railways apologised for the inconvenience caused.