railroad insurance rating

例句：

1. 1.The railroad company has been rated as one of the top five in the industry.
   这家铁路公司被评为行业内前五名之一。
2. 2.The new safety regulations have improved the railroad's insurance rating.
   新的安全规定提高了铁路的保险评级。
3. 3. The railroad company is now rated as having a high level of safety.
   该铁路公司现在被评为具有高安全性水平。