RAF veterans Mary Roberts and Wing Commander John Wynne unveiled the plaque. (Picture: Virgin Trains)
A train has been named to commemorate the Royal Air Force's centenary.
Two Second World War veterans unveiled a plaque reading: 'Royal Air Force Centenary 1918-2018'.
The ceremony was conducted by John Wynne, who served as a pilot and flying instructor, and Mary Roberts, who was a nurse.
It was held at Holyhead station near RAF Valley on Anglesey, where RAF's fighter pilots are trained.
Ms Roberts, whose role saw her based at RAF Hemswell, Lincolnshire and Flying Training Command at Penrhos, North Wales, said:
"I am thrilled to have been invited to take part in this special occasion during the RAF's centenary year.
"God bless the train and all who travel in her."
Air Commodore Adrian Williams, the RAF's senior officer in Wales, added:
"We know that having an engine named after you is a rare and special thing, so the RAF is delighted to be recognised in this way."