Eurostar trains through the Channel Tunnel are multisystem; a significant part of the route near London was on southern England's 750 V DC third rail system, the route into Brussels is 3,000 V DC overhead, while the rest of the route is 25 kV 50 Hz overhead. The need for these trains to use third rail into London Waterloo station ended upon completion of High Speed 1 line in 2007. Southern England uses some overhead/third rail dual-system locomotives, such as the class 92 for Channel Tunnel, and multiple units, e.g. the Class 319 on Thameslink services, to allow through running between 750 V DC third rail south of London and 25 kV AC overhead north and east of London.