To considerable surprise, the Thatcher government, which had been perceived as anti-rail, authorised the electrification of the East Coast Main Line including the line from Doncaster to Leeds from 1985, with the work completed in 1991. At a regional level, Network SouthEast undertook numerous electrification projects, including the Midland Main Line to Bedford and the Southern 750 V DC system reached Hastings and Weymouth. Electrification in East Anglia included the line from London Liverpool Street to Norwich and also to King's Lynn. Thameslink, a service that connected the northern and southern halves of London's suburban network, was introduced via the re-opened Snow Hill tunnel in 1988. The Chiltern Main Line was extensively modernised to open up an additional link between London Marylebone and Birmingham Snow Hill. The service was successfully launched in 1987.