It has a designed speed of 350 kilometers per hour.
其设计时速为每小时350公里。
CRI在线 2021年1月合集
The domestically developed maglev train boasts a designed speed of 620 kilometers per hour.
这款国产研发的磁悬浮列车设计时速为620公里/小时。
CRI在线 2020年9月合集
With a designed speed of 350 km per hour, the stretch from the Daxing airport to Xiong'an is expected to open at the end of this year.
大兴机场至雄安段设计时速350公里，预计今年年底通车。
英语百科
Design speed
The design speed is a tool used to determine geometric features of a new road during road design. Contrary to the word's implication, a road's design speed is not necessarily its maximum safe speed; that can be higher or lower.