the Queen's funny bone.The huge smile on her face said it all – the idea of a Tube stop for Buckingham Palace tickled
The monarch, who used to use the Tube as a young lady, was presented with the personalised sign for the fictional stop during a visit to Aldgate station this week.
London Underground's chief operating officer Howard Collins said: "The Queen thought it was marvellous. She said, 'What a fantastic gift'."
The trip also had a more sombre aspect as the monarch was shown the plaque commemorating the 52 people who died during the July 7 bombings.
The Queen's first trip on the underground came in 1939, aged 13, when she caught it with her governess and Princess Margaret.
And in 1977, she experienced riding in the driver's cab of a Tube train when she opened the Picadilly Line extension.
During her tour of the city, the 83-year-old royal – who shielded herself from the rain with a see-through birdcage umbrella – had lunch at 30 St Mary Axe, aka the Gherkin building.
She also visited Tower Bridge and the Royal National Lifeboat Institution station on the Thames riverbank.