A computer gremlin has rebranded parts of the London Tube network as an American-style metro on one of the world's most popular digital maps.
London Underground's distinctive 'roundels' on Google Maps have suddenly been replaced by the "M" used by the New York Subway. Stations like Charing Cross now appear to be served by a metro system.
A spokesman for Google confirmed a bug was to blame.
Some stations, such as South Kenton, still have the correct Tube logos.