The Prince of Wales and Duchess of Cornwall have taken their first joint trip using the Underground.
Charles and Camilla celebrated the 150th anniversary of the capital's transport network by touring a small part of it and visiting some stations.
The Prince and Duchess travelled by Tube, riding for just one stop from Farringdon to King's Cross on a Metropolitan line train.
Charles last travelled on the Tube network in April 1979 when he opened the first stage of the Jubilee line, while Camilla is thought to have used the London Underground (LU) in the past.
The royal couple were given specially designed oyster cards celebrating the Tube's anniversary and used the pre-paid smart cards to swipe their way through the barriers at Farringdon.
They both qualify for a Freedom Pass for the over-60s, but their oyster cards had £10 credit for the journey, which costs £2.10. The cards are expected to be retained by the Royal Collection.
In their carriage were senior LU and Transport for London staff and Charles and Camilla sat next to each other on the train bound for Uxbridge in west London, while most of their hosts stood.
Camilla sat opposite Metropolitan line manager Angela Back and speaking about the immaculate train said: "Very nice, very smart."
"Just one stop?" Charles asked Tube bosses when he and the Duchess arrived at King's Cross station after their three-minute trip from Farringdon.
Prior to boarding, Howard Collins, the Tube's chief operating officer, asked Charles if he would like to drive the train - as he did a year ago during the Bombardier factory visit. "I will do as I'm told," Charles jokingly replied.