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).
Higher-speed rail
Additionally, the FRA establishes classification of track quality which regulates the speed limits of the trains with Class 5, Class 6, Class 7 and Class 8 for top speeds of , , and , respectively. The FRA also regulates passenger train design and safety standards to ensure trains that operate at speeds of up to comply with its "Tier I" standard and trains that operate at speeds up to comply with its "Tier II" standard.