linguistic:translation
United Kingdom

The UK's fastest high-speed line (High Speed 1) connects London St Pancras with Brussels, Paris and Amsterdam through the Channel Tunnel. At speeds of up to 300 km/h (186 mph), it is the only high-speed line in Britain with an operating speed of more than 125 mph (201 km/h).

The Great Western Main Line, South Wales Main Line, West Coast Main Line, Midland Main Line, Cross Country Route and East Coast Main Line all have maximum speed limits of 125 mph (201 km/h). Attempts to increase speeds to 140 mph (225 km/h) on both the West Coast Main Line and East Coast Main Line were abandoned in the 1980s, due to trains operating on those lines not being capable of cab signalling, which was made a legal requirement in the UK for tracks permitted to operate any service at speeds greater than 125 mph (201 km/h), due to the impracticality of observing lineside signals at such speeds.