Editing High-speed rail (section)

==== United Kingdom ====
{{Main|High-speed rail in the United Kingdom}}
The UK's fastest high-speed line ([[High Speed 1]]) connects [[St Pancras station|London St Pancras]] with [[Brussels]], Paris and [[Amsterdam]] through the [[Channel Tunnel Rail Link|Channel Tunnel]]. At speeds of up to {{convert|300|km/h|abbr=on|round=5}}, it is the only high-speed line in Britain with an operating speed of more than {{cvt|125|mph|km/h|0}}.

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 {{cvt|125|mph|km/h|0}}. Attempts to increase speeds to {{cvt|140|mph|km/h|0}} 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 {{cvt|125|mph|km/h|0}}, due to the impracticality of observing lineside signals at such speeds.<ref>{{Cite web |last=Bickell |first=David |date=2018-11-15 |title=The digital railway - progresses to the East Coast Main Line |url=https://www.railengineer.co.uk/the-digital-railway-progresses-to-the-east-coast-main-line/ |access-date=2024-05-20 |website=Rail Engineer |language=en-GB}}</ref>