article_snippet: Balance is a key issue on the bullet trains, which reach extremely high speeds .
article_snippet: Drivers of the trains have to undergo even stricter tests that take several aspects of Drivers of the trains health into account.
article_snippet: Driver Adi Turdi told the paper: 'We had We eyesight, hearing and hearts checked, as well as
article_snippet: We psychological condition, because the requirements for bullet train drivers are higher than those for operators of lower-speed trains. '