Punktförmige Zugbeeinflussung
After acknowledging the warning signal the train has to stay below the braking curve (German "Bremskurve") - fast trains may travel up to 165 km/h and they must reduce the speed to below 85 km/h after 23 seconds. Note that the operation of high speed trains beyond 165 km/h is not based on visual wayside signals or PZB inductors (using LZB or European Train Control System cab-signalling instead in Germany).
High-speed rail
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 on part of the line. Attempts to increase speeds to on both the West Coast Main Line and East Coast Main Line have failed because the trains on those lines do not have cab signalling, which is a legal requirement in the UK for trains to be permitted to operate at speeds greater than due to the impracticality of observing lineside signals at such speeds.