A 19th Century steam train took passengers on the London Underground today to mark the 150th anniversary of the first Tube journey in the capital.
Specially invited passengers moved off from Kensington Olympia Tube station in west London aboard a train pulled by Met Locomotive 1, which was built in 1898.
The first stretch of the world-famous network opened on January 9 1863 - between Paddington and Farringdon - when it was known as the Metropolitan Railway.
Hundreds of rail enthusiasts, families and interested onlookers took up positions at stations and on bridges to catch a glimpse of the train, as it travelled non-stop to Moorgate station in the City of London.
Spectators at Underground stations were covered in steam as the train made its way along the same track used by modern day Tube services.
– Boris Johnson, Mayor of London
"It was just extraordinary. We had steam coming in through the windows, huge thick clouds of white steam going past and then bits of soot coming through from the engine."