Regardless, this means that unusually hot or prolonged heat  waves typically require trains to abide by a new set of rules—when Amtrak's am-tracks  register over 131 degrees Fahrenheit, they'll cap train speeds at 100 miles per hour  as a cautionary measure.

无论如何， 这意味着异常炎热或长时间的热浪通常要求列车遵守一套新的规则——当Amtrak的轨道温度超过131华氏度时，他们将把列车速度限制在每小时100英里， 作为一项谨慎措施。