Stoplights are red, yellow, and green, because traffic officials, early on copied the code system railroad engineers devised for track systems controlling the trains.
交通信号灯采用红、黄、绿三种颜色，是因为早期的交通指挥官模仿铁路工程师所设计的用于铁道系统控制火车的编码系统。
The color alone, railroad engineers reasoned, should give people cause to pause, to abide by the signal, and to stop or suffer the consequences of death and destruction.
铁路工程师们推断，红色本身就提醒人们暂停，或呆在该信号旁边，或停止前进，否则将会遭受死亡或损毁的后果。
These regulations address track, equipment, railroad operating rules and practices, qualification and certification of locomotive engineers, control of alcohol and drug use, and other subject matters.
这些规定阐述了涉及诸多事宜，包括：轨道、设备、铁路的运营规定和操作方法、列车司机的资格鉴定和认证、酒精和药物的使用的管制等，以及其他主题。
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