The station opened in 1863 along with the Metropolitan line, subsequently catering for the Hammersmith &amp; City and Circle lines. It was expanded in 1868 with the opening of the City Widened Lines, and the Northern and Piccadilly platforms opened in the early 20th century. During the 1930s and 1940s, the station was restructured and partially rebuilt to cater for expanded traffic. The Victoria line connection opened in 1968. The 1987 King's Cross fire that killed 31 people is the deadliest accident to occur on the Underground and resulted in widespread safety improvements and changes throughout the network. The station was extensively rebuilt in the early 21st century to cater for Eurostar services that moved from Waterloo to St Pancras, reopening in 2007.