附录a提供了当前要求和轨道安全标准相关之未决问题的陈述范本。
Appendix Aprovides a representation of current requirements and open issues related to track safety standards.
《轨道安全标准》（《联邦法典》第14卷第213部分）根据最大容许速度，就九个等级的铁轨明确了要求。
The Track Safety Standards (49 CFR Part 213) specify requirements for nine classes of track based on maximum allowable speed.
现存的联邦铁路局轨道安全标准十分全面，对高达200英里/小时（约合322公里/小时）的速度指定了FRA 1～9类这9种类型的轨道几何形状和欠高。
Existing FRA tracksafety standards are comprehensive and specify track geometry and cant deficiency for FRA Classes 1 through 9 at speeds up to 200 mph.
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