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  The virgin operation of Shanghai maglev on December 31 of 2002 was a new milestone in human transportation history. The maglev has the highest speed among land traffic, which is up to 500 km/h. During the high speed operation, the elevated track beam will subject to intense vibration with a frequency quickly varying between 0 to 2000 Hz. To prevent the track beam fastener from loosening under vibration with a quickly varying frequency, three fastening schemes were established, among which there is DTFLOCK nuts. After 90 days of trial operation, DTFLOCK anti-loosening nuts demonstrated outstanding anti-loosening performance. No loose DTFLOCK nut were found on the track beam. The DTFLOCK fastening scheme provided reliable support to the safe operation of the maglev train and further replaced the other two fastening schemes.