<Dl> <Dd> <Ol> <Li> Infrastructure: track built specially for high - speed travel or specially upgraded for high - speed travel . </Li> <Li> Minimum Speed Limit: Minimum speed of 250 km / h (155 mph) on lines specially built for high speed and of about 200 km / h (124 mph) on existing lines which have been specially upgraded . This must apply to at least one section of the line . Rolling stock must be able to reach a speed of at least 200 km / h (124 mph) to be considered high speed . </Li> <Li> Operating conditions: Rolling stock must be designed alongside its infrastructure for complete compatibility, safety and quality of service . </Li> </Ol> </Dd> </Dl> <Dd> <Ol> <Li> Infrastructure: track built specially for high - speed travel or specially upgraded for high - speed travel . </Li> <Li> Minimum Speed Limit: Minimum speed of 250 km / h (155 mph) on lines specially built for high speed and of about 200 km / h (124 mph) on existing lines which have been specially upgraded . This must apply to at least one section of the line . Rolling stock must be able to reach a speed of at least 200 km / h (124 mph) to be considered high speed . </Li> <Li> Operating conditions: Rolling stock must be designed alongside its infrastructure for complete compatibility, safety and quality of service . </Li> </Ol> </Dd> <Ol> <Li> Infrastructure: track built specially for high - speed travel or specially upgraded for high - speed travel . </Li> <Li> Minimum Speed Limit: Minimum speed of 250 km / h (155 mph) on lines specially built for high speed and of about 200 km / h (124 mph) on existing lines which have been specially upgraded . This must apply to at least one section of the line . Rolling stock must be able to reach a speed of at least 200 km / h (124 mph) to be considered high speed . </Li> <Li> Operating conditions: Rolling stock must be designed alongside its infrastructure for complete compatibility, safety and quality of service . </Li> </Ol> <Li> Infrastructure: track built specially for high - speed travel or specially upgraded for high - speed travel . </Li>

Speed of fastest bullet train in the world